Skip tst_QGraphicsProxyWidget::popup_subwidget on Windows.

Task-number: QTBUG-33213
Change-Id: I1c8daa3a859f9d0d760054f1d8934abd84f62f0d
Reviewed-by: Andreas Aardal Hanssen <andreas@hanssen.name>

tests/auto/widgets/graphicsview/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp

@@ -2502,6 +2502,9 @@ void tst_QGraphicsProxyWidget::popup_basic()
 
 void tst_QGraphicsProxyWidget::popup_subwidget()
 {
+#ifdef Q_OS_WIN
+    QSKIP("This test crashes on Windows, QTBUG-33213");
+#endif
     QGroupBox *groupBox = new QGroupBox;
     groupBox->setTitle("GroupBox");
     groupBox->setCheckable(true);