QNX: Remove most of the CPU overhead for video rendering

This patch uses the GL_OES_EGL_image extension to create a OpenGL Texture handle
for a libscreen pixmap. If the extension is not available it uses the "old"
technique as fallback where the image data is copied into a QImage.

This reduces the CPU load by more than 70% and allows HD videos to be played jitter-free.

Task-number: QTBUG-37752

Change-Id: I4cad22c39390e4cf9eb5be5f0bfe446544a11b9e
Reviewed-by: Bernd Weimer <bweimer@blackberry.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/plugins/qnx/mediaplayer/mmrendererplayervideorenderercontrol.h

@@ -67,8 +67,10 @@ public:
     void pause();
     void resume();
 
+    void customEvent(QEvent *) Q_DECL_OVERRIDE;
+
 private Q_SLOTS:
-    void frameGrabbed(const QImage &frame);
+    void frameGrabbed(const QImage &frame, int);
 
 private:
     QPointer<QAbstractVideoSurface> m_surface;