Qt: fix always on top deactivation on Windows

See QTBUG-30359
Close #13646

contrib/src/qt/Win32-AOT.patch

+--- qt/src/plugins/platforms/windows/qwindowswindow.cpp.old	2015-02-15 21:05:36.302825488 +0100
++++ qt/src/plugins/platforms/windows/qwindowswindow.cpp	2015-02-15 21:06:11.562824592 +0100
+@@ -651,7 +651,7 @@
+         } else if (flags & Qt::WindowStaysOnBottomHint) {
+             SetWindowPos(hwnd, HWND_BOTTOM, 0, 0, 0, 0, swpFlags);
+         } else if (frameChange) { // Force WM_NCCALCSIZE with wParam=1 in case of custom margins.
+-            SetWindowPos(hwnd, 0, 0, 0, 0, 0, swpFlags);
++            SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, swpFlags);
+         }
+         if (flags & (Qt::CustomizeWindowHint|Qt::WindowTitleHint)) {
+             HMENU systemMenu = GetSystemMenu(hwnd, FALSE);

contrib/src/qt/rules.mak

@@ -24,6 +24,7 @@ $(TARBALLS)/qt-$(QT_VERSION).tar.xz:
 qt: qt-$(QT_VERSION).tar.xz .sum-qt
 	$(UNPACK)
 	mv qtbase-opensource-src-$(QT_VERSION) qt-$(QT_VERSION)
+	$(APPLY) $(SRC)/qt/Win32-AOT.patch
 	$(MOVE)
 
 ifdef HAVE_MACOSX