tst_QWindow::framePositioning: Skip on Android and fullscreen-only systems

The framePositioning test was split out from the positioning test, but
without the existing skips. Turns out we do need the same skips, so
add them.

Pick-to: 6.8
Change-Id: Ib5d1cdf474a3a88a154c7cdc8df346668c8053d6
Reviewed-by: Tinja Paavoseppä <tinja.paavoseppa@qt.io>

tests/auto/gui/kernel/qwindow/tst_qwindow.cpp

@@ -608,6 +608,13 @@ void tst_QWindow::framePositioning_data()
 
 void tst_QWindow::framePositioning()
 {
+#ifdef Q_OS_ANDROID
+    QSKIP("Fails on Android. QTBUG-105201");
+#endif
+    if (!QGuiApplicationPrivate::platformIntegration()->hasCapability(
+                QPlatformIntegration::NonFullScreenWindows)) {
+        QSKIP("This platform does not support non-fullscreen windows");
+    }
     if (isPlatformWayland())
         QSKIP("Wayland: This fails. See QTBUG-68660.");