Fix compilation with MinGW-w64

Change-Id: I0c9e6adc54ccce34e0f81af048f2a51a4ac051b4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/platforms/windows/qtwindows_additional.h

@@ -83,7 +83,7 @@
 #define CHILDID_SELF 0
 #define WM_GETOBJECT 0x003D
 
-#ifndef SIID_SHIELD // Shell structures for icons.
+#ifndef SHGFI_ADDOVERLAYS // Shell structures for icons.
 typedef struct _SHSTOCKICONINFO
 {
     DWORD cbSize;

src/plugins/platforms/windows/qwindowstheme.cpp

@@ -587,7 +587,7 @@ public:
 
     T operator * () const
     {
-        return reinterpret_cast<T>(this);
+        return T(qintptr(this));
     }
 
     void operator delete (void *) {}

src/plugins/platforms/windows/qwindowswindow.cpp

@@ -708,8 +708,8 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const WindowData &data) :
 #ifdef Q_OS_WINCE
     m_previouslyHidden(false),
 #endif
-    m_iconBig(0),
-    m_iconSmall(0)
+    m_iconSmall(0),
+    m_iconBig(0)
 {
     if (aWindow->surfaceType() == QWindow::OpenGLSurface)
         setFlag(OpenGLSurface);