Add private structs to all remaining headers

These are not used currently. Just put them in now in
case we need them in the future.

gtk/a11y/gtkboxaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkBoxAccessible        GtkBoxAccessible;
 typedef struct _GtkBoxAccessibleClass   GtkBoxAccessibleClass;
+typedef struct _GtkBoxAccessiblePrivate GtkBoxAccessiblePrivate;
 
 struct _GtkBoxAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkBoxAccessiblePrivate *priv;
 };
 
 struct _GtkBoxAccessibleClass

gtk/a11y/gtkbuttonaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkButtonAccessible        GtkButtonAccessible;
 typedef struct _GtkButtonAccessibleClass   GtkButtonAccessibleClass;
+typedef struct _GtkButtonAccessiblePrivate GtkButtonAccessiblePrivate;
 
 struct _GtkButtonAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkButtonAccessiblePrivate *priv;
 };
 
 struct _GtkButtonAccessibleClass

gtk/a11y/gtkcellaccessible.h

@@ -32,10 +32,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkCellAccessible        GtkCellAccessible;
 typedef struct _GtkCellAccessibleClass   GtkCellAccessibleClass;
+typedef struct _GtkCellAccessiblePrivate GtkCellAccessiblePrivate;
 
 struct _GtkCellAccessible
 {
   GtkAccessible parent;
+
+  GtkCellAccessiblePrivate *priv;
 };
 
 struct _GtkCellAccessibleClass

gtk/a11y/gtkcheckmenuitemaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkCheckMenuItemAccessible        GtkCheckMenuItemAccessible;
 typedef struct _GtkCheckMenuItemAccessibleClass   GtkCheckMenuItemAccessibleClass;
+typedef struct _GtkCheckMenuItemAccessiblePrivate GtkCheckMenuItemAccessiblePrivate;
 
 struct _GtkCheckMenuItemAccessible
 {
   GtkMenuItemAccessible parent;
+
+  GtkCheckMenuItemAccessiblePrivate *priv;
 };
 
 struct _GtkCheckMenuItemAccessibleClass

gtk/a11y/gtkcolorswatchaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkColorSwatchAccessible        GtkColorSwatchAccessible;
 typedef struct _GtkColorSwatchAccessibleClass   GtkColorSwatchAccessibleClass;
+typedef struct _GtkColorSwatchAccessiblePrivate GtkColorSwatchAccessiblePrivate;
 
 struct _GtkColorSwatchAccessible
 {
   GtkWidgetAccessible parent;
+
+  GtkColorSwatchAccessiblePrivate *priv;
 };
 
 struct _GtkColorSwatchAccessibleClass

gtk/a11y/gtkexpanderaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkExpanderAccessible        GtkExpanderAccessible;
 typedef struct _GtkExpanderAccessibleClass   GtkExpanderAccessibleClass;
+typedef struct _GtkExpanderAccessiblePrivate GtkExpanderAccessiblePrivate;
 
 struct _GtkExpanderAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkExpanderAccessiblePrivate *priv;
 };
 
 struct _GtkExpanderAccessibleClass

gtk/a11y/gtkframeaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkFrameAccessible        GtkFrameAccessible;
 typedef struct _GtkFrameAccessibleClass   GtkFrameAccessibleClass;
+typedef struct _GtkFrameAccessiblePrivate GtkFrameAccessiblePrivate;
 
 struct _GtkFrameAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkFrameAccessiblePrivate *priv;
 };
 
 struct _GtkFrameAccessibleClass

gtk/a11y/gtklockbuttonaccessible.h

@@ -32,10 +32,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkLockButtonAccessible        GtkLockButtonAccessible;
 typedef struct _GtkLockButtonAccessibleClass   GtkLockButtonAccessibleClass;
+typedef struct _GtkLockButtonAccessiblePrivate GtkLockButtonAccessiblePrivate;
 
 struct _GtkLockButtonAccessible
 {
   GtkButtonAccessible parent;
+
+  GtkLockButtonAccessiblePrivate *priv;
 };
 
 struct _GtkLockButtonAccessibleClass

gtk/a11y/gtkmenuaccessible.h

@@ -32,10 +32,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkMenuAccessible        GtkMenuAccessible;
 typedef struct _GtkMenuAccessibleClass   GtkMenuAccessibleClass;
+typedef struct _GtkMenuAccessiblePrivate GtkMenuAccessiblePrivate;
 
 struct _GtkMenuAccessible
 {
   GtkMenuShellAccessible parent;
+
+  GtkMenuAccessiblePrivate *priv;
 };
 
 struct _GtkMenuAccessibleClass

gtk/a11y/gtkmenushellaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkMenuShellAccessible        GtkMenuShellAccessible;
 typedef struct _GtkMenuShellAccessibleClass   GtkMenuShellAccessibleClass;
+typedef struct _GtkMenuShellAccessiblePrivate GtkMenuShellAccessiblePrivate;
 
 struct _GtkMenuShellAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkMenuShellAccessiblePrivate *priv;
 };
 
 struct _GtkMenuShellAccessibleClass

gtk/a11y/gtkpanedaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkPanedAccessible        GtkPanedAccessible;
 typedef struct _GtkPanedAccessibleClass   GtkPanedAccessibleClass;
+typedef struct _GtkPanedAccessiblePrivate GtkPanedAccessiblePrivate;
 
 struct _GtkPanedAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkPanedAccessiblePrivate *priv;
 };
 
 struct _GtkPanedAccessibleClass

gtk/a11y/gtkprogressbaraccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkProgressBarAccessible        GtkProgressBarAccessible;
 typedef struct _GtkProgressBarAccessibleClass   GtkProgressBarAccessibleClass;
+typedef struct _GtkProgressBarAccessiblePrivate GtkProgressBarAccessiblePrivate;
 
 struct _GtkProgressBarAccessible
 {
   GtkWidgetAccessible parent;
+
+  GtkProgressBarAccessiblePrivate *priv;
 };
 
 struct _GtkProgressBarAccessibleClass

gtk/a11y/gtkrangeaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkRangeAccessible        GtkRangeAccessible;
 typedef struct _GtkRangeAccessibleClass   GtkRangeAccessibleClass;
+typedef struct _GtkRangeAccessiblePrivate GtkRangeAccessiblePrivate;
 
 struct _GtkRangeAccessible
 {
   GtkWidgetAccessible parent;
+
+  GtkRangeAccessiblePrivate *priv;
 };
 
 struct _GtkRangeAccessibleClass

gtk/a11y/gtkscaleaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkScaleAccessible        GtkScaleAccessible;
 typedef struct _GtkScaleAccessibleClass   GtkScaleAccessibleClass;
+typedef struct _GtkScaleAccessiblePrivate GtkScaleAccessiblePrivate;
 
 struct _GtkScaleAccessible
 {
   GtkRangeAccessible parent;
+
+  GtkScaleAccessiblePrivate *priv;
 };
 
 struct _GtkScaleAccessibleClass

gtk/a11y/gtkscalebuttonaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkScaleButtonAccessible        GtkScaleButtonAccessible;
 typedef struct _GtkScaleButtonAccessibleClass   GtkScaleButtonAccessibleClass;
+typedef struct _GtkScaleButtonAccessiblePrivate GtkScaleButtonAccessiblePrivate;
 
 struct _GtkScaleButtonAccessible
 {
   GtkButtonAccessible parent;
+
+  GtkScaleButtonAccessiblePrivate *priv;
 };
 
 struct _GtkScaleButtonAccessibleClass

gtk/a11y/gtkscrollbaraccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkScrollbarAccessible        GtkScrollbarAccessible;
 typedef struct _GtkScrollbarAccessibleClass   GtkScrollbarAccessibleClass;
+typedef struct _GtkScrollbarAccessiblePrivate GtkScrollbarAccessiblePrivate;
 
 struct _GtkScrollbarAccessible
 {
   GtkRangeAccessible parent;
+
+  GtkScrollbarAccessiblePrivate *priv;
 };
 
 struct _GtkScrollbarAccessibleClass

gtk/a11y/gtkscrolledwindowaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkScrolledWindowAccessible        GtkScrolledWindowAccessible;
 typedef struct _GtkScrolledWindowAccessibleClass   GtkScrolledWindowAccessibleClass;
+typedef struct _GtkScrolledWindowAccessiblePrivate GtkScrolledWindowAccessiblePrivate;
 
 struct _GtkScrolledWindowAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkScrolledWindowAccessiblePrivate *priv;
 };
 
 struct _GtkScrolledWindowAccessibleClass

gtk/a11y/gtkspinbuttonaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkSpinButtonAccessible        GtkSpinButtonAccessible;
 typedef struct _GtkSpinButtonAccessibleClass   GtkSpinButtonAccessibleClass;
+typedef struct _GtkSpinButtonAccessiblePrivate GtkSpinButtonAccessiblePrivate;
 
 struct _GtkSpinButtonAccessible
 {
   GtkEntryAccessible parent;
+
+  GtkSpinButtonAccessiblePrivate *priv;
 };
 
 struct _GtkSpinButtonAccessibleClass

gtk/a11y/gtkspinneraccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkSpinnerAccessible        GtkSpinnerAccessible;
 typedef struct _GtkSpinnerAccessibleClass   GtkSpinnerAccessibleClass;
+typedef struct _GtkSpinnerAccessiblePrivate GtkSpinnerAccessiblePrivate;
 
 struct _GtkSpinnerAccessible
 {
   GtkWidgetAccessible parent;
+
+  GtkSpinnerAccessiblePrivate *priv;
 };
 
 struct _GtkSpinnerAccessibleClass

gtk/a11y/gtkstatusbaraccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkStatusbarAccessible        GtkStatusbarAccessible;
 typedef struct _GtkStatusbarAccessibleClass   GtkStatusbarAccessibleClass;
+typedef struct _GtkStatusbarAccessiblePrivate GtkStatusbarAccessiblePrivate;
 
 struct _GtkStatusbarAccessible
 {
   GtkBoxAccessible parent;
+
+  GtkStatusbarAccessiblePrivate *priv;
 };
 
 struct _GtkStatusbarAccessibleClass

gtk/a11y/gtkswitchaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkSwitchAccessible        GtkSwitchAccessible;
 typedef struct _GtkSwitchAccessibleClass   GtkSwitchAccessibleClass;
+typedef struct _GtkSwitchAccessiblePrivate GtkSwitchAccessiblePrivate;
 
 struct _GtkSwitchAccessible
 {
   GtkWidgetAccessible parent;
+
+  GtkSwitchAccessiblePrivate *priv;
 };
 
 struct _GtkSwitchAccessibleClass

gtk/a11y/gtktogglebuttonaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkToggleButtonAccessible        GtkToggleButtonAccessible;
 typedef struct _GtkToggleButtonAccessibleClass   GtkToggleButtonAccessibleClass;
+typedef struct _GtkToggleButtonAccessiblePrivate GtkToggleButtonAccessiblePrivate;
 
 struct _GtkToggleButtonAccessible
 {
   GtkButtonAccessible parent;
+
+  GtkToggleButtonAccessiblePrivate *priv;
 };
 
 struct _GtkToggleButtonAccessibleClass

gtk/a11y/gtkwindowaccessible.h

@@ -31,10 +31,13 @@ G_BEGIN_DECLS
 
 typedef struct _GtkWindowAccessible        GtkWindowAccessible;
 typedef struct _GtkWindowAccessibleClass   GtkWindowAccessibleClass;
+typedef struct _GtkWindowAccessiblePrivate GtkWindowAccessiblePrivate;
 
 struct _GtkWindowAccessible
 {
   GtkContainerAccessible parent;
+
+  GtkWindowAccessiblePrivate *priv;
 };
 
 struct _GtkWindowAccessibleClass