QNX: Advertise geometry changes to Qt event system

Some QWindow subclass rely on those events to be sent to know when
the window geometry changes (e.g. QQuickCanvas).

Change-Id: I16d3928803d09761f265544fdf10a5d080fccc17
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>

src/plugins/platforms/qnx/qqnxwindow.cpp

@@ -188,6 +188,8 @@ void QQnxWindow::setGeometry(const QRect &rect)
         qFatal("QQnxWindow: failed to set window source size, errno=%d", errno);
     }
 
+    QWindowSystemInterface::handleGeometryChange(window(), rect);
+
     // Now move all children.
     QPoint offset;
     if (!oldGeometry.isEmpty()) {