gtkx: Add support for g_autoptr()

https://bugzilla.gnome.org/show_bug.cgi?id=743640

gtk/Makefile.am

@@ -109,6 +109,7 @@ gtk_public_h_sources = 		\
 	gtk.h			\
 	gtk-autocleanups.h	\
 	gtkx.h			\
+	gtkx-autocleanups.h	\
 	gtk-a11y.h		\
 	gtkaboutdialog.h	\
 	gtkaccelgroup.h		\

gtk/gtkx-autocleanups.h

@@ -0,0 +1,27 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GTKX_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtkx.h> can be included directly."
+#endif
+
+#ifndef __GI_SCANNER__
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkSocket, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkPlug, g_object_unref)
+
+#endif

gtk/gtkx.h

@@ -29,6 +29,8 @@
 #include <gtk/gtksocket.h>
 #include <gtk/gtkplug.h>
 
+#include <gtk/gtkx-autocleanups.h>
+
 #undef __GTKX_H_INSIDE__
 
 #endif /* __GTK_X_H__ */