Fix finding widgets for Windows Embedded Compact

ChildWindowFromPoint does not work properly under
wince, so lets use the plain old WindowFromPoint.

Task-number: QTBUG-44022
Change-Id: I49bae6409f2d11ddc01bea01f4c2f91a02b90892
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

src/plugins/platforms/windows/qwindowscontext.cpp

@@ -676,7 +676,7 @@ static inline bool findPlatformWindowHelper(const POINT &screenPoint, unsigned c
     const HWND child = ChildWindowFromPointEx(*hwnd, point, cwexFlags);
 #else
     Q_UNUSED(cwexFlags)
-    const HWND child = ChildWindowFromPoint(*hwnd, point);
+    const HWND child = WindowFromPoint(point);
 #endif
     if (!child || child == *hwnd)
         return false;