Skip tst_QMenu::pushButtonPopulateOnAboutToShow on macOS

The combobox popup can overlap a little with the button, and that's the
expected behavior.

Change-Id: I245bfce85cb5ee661ceb51dbe0d844492878a2bc
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

tests/auto/widgets/widgets/qmenu/tst_qmenu.cpp

@@ -1066,6 +1066,10 @@ static inline QByteArray msgGeometryIntersects(const QRect &r1, const QRect &r2)
 
 void tst_QMenu::pushButtonPopulateOnAboutToShow()
 {
+#ifdef Q_OS_MACOS
+    QSKIP("Popup menus may partially overlap the button on macOS, and that's okey");
+#endif
+
     QPushButton b("Test PushButton");
     b.setWindowFlags(Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint);