Skip unstable test

Task-number: QTBUG-23976

Change-Id: I81f820e064808d170094e6dcf9cbe35edf7bda35
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

tests/auto/qtquick2/qquickmousearea/tst_qquickmousearea.cpp

@@ -611,6 +611,7 @@ void tst_QQuickMouseArea::preventStealing()
 
 void tst_QQuickMouseArea::clickThrough()
 {
+    QSKIP("QTBUG-23976 Unstable");
     //With no handlers defined click, doubleClick and PressAndHold should propagate to those with handlers
     QQuickView *canvas = createView();
     canvas->setSource(testFileUrl("clickThrough.qml"));