Always include qt_windows header first

qt_windows takes care of setting NOMINMAX, which prevents native headers
from defining `min` and `max` as macros, breaking the build. So include
that header always as the first header.

Change-Id: I82cd8b21d263102000e6e66f135465bc2c126db4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit 29a7489769bca59630782061789561fb07d77892)
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/plugins/platforms/direct2d/qwindowsdirect2dcontext.cpp

@@ -37,6 +37,7 @@
 **
 ****************************************************************************/
 
+#include <QtCore/qt_windows.h>
 #include "qwindowsdirect2dcontext.h"
 #include "qwindowsdirect2dhelpers.h"
 #include "qwindowsdirect2dintegration.h"

src/plugins/platforms/direct2d/qwindowsdirect2dintegration.cpp

@@ -37,6 +37,7 @@
 **
 ****************************************************************************/
 
+#include <QtCore/qt_windows.h>
 #include "qwindowsdirect2dcontext.h"
 #include "qwindowsdirect2dintegration.h"
 #include "qwindowsdirect2dbackingstore.h"

src/plugins/platforms/windows/qwindowsdialoghelpers.cpp

@@ -43,6 +43,7 @@
 #define _WIN32_WINNT 0x0A00
 #endif
 
+#include <QtCore/qt_windows.h>
 #include "qwindowscombase.h"
 #include "qwindowsdialoghelpers.h"
 
@@ -75,8 +76,6 @@
 #include <algorithm>
 #include <vector>
 
-#include <QtCore/qt_windows.h>
-
 // #define USE_NATIVE_COLOR_DIALOG /* Testing purposes only */
 
 QT_BEGIN_NAMESPACE

src/plugins/platforms/windows/qwindowsdrag.cpp

@@ -37,6 +37,7 @@
 **
 ****************************************************************************/
 
+#include <QtCore/qt_windows.h>
 #include "qwindowsdrag.h"
 #include "qwindowscontext.h"
 #include "qwindowsscreen.h"
@@ -45,7 +46,6 @@
 #endif
 #include "qwindowsintegration.h"
 #include "qwindowsdropdataobject.h"
-#include <QtCore/qt_windows.h>
 #include "qwindowswindow.h"
 #include "qwindowsmousehandler.h"
 #include "qwindowscursor.h"