Test fails always on Android, so skip it

Previously the failure was been ignored because of the very generic
"linux" entry in the BLACKLIST file

Task-number: QTBUG-105201
Change-Id: I6914fe350f78266fc18541eb8fcd881f5a4ac511
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

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

@@ -493,6 +493,9 @@ static bool isPlatformWayland()
 
 void tst_QWindow::positioning()
 {
+#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");