Disable -Woverloaded-virtual also for clang-cl

Task-number: QTBUG-63512
Change-Id: I4447f8f8746717a5f3ce161da8d7dbf10d162636
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

src/activeqt/control/qaxfactory.h

@@ -55,6 +55,7 @@
 
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Woverloaded-virtual") // gcc complains about QObject::metaObject() being hidden.
+QT_WARNING_DISABLE_CLANG("-Woverloaded-virtual") // clang-cl complains about QObject::metaObject() being hidden.
 
 #include <QtCore/qhash.h>
 #include <QtCore/quuid.h>