ges-video-source: Disable videoflip

That allows system memory only. Should be able to handle non-system memory
via other way

ges/ges-video-source.c

@@ -130,11 +130,13 @@ ges_video_source_create_filters (GESVideoSource * self, GPtrArray * elements,
   if (needs_converters)
     g_ptr_array_add (elements, gst_element_factory_make ("videoconvert", NULL));
 
+#if 0
   /* If there's image-orientation tag, make sure the image is correctly oriented
    * before we scale it. */
   videoflip = gst_element_factory_make ("videoflip", "track-element-videoflip");
   g_object_set (videoflip, "video-direction", GST_VIDEO_ORIENTATION_AUTO, NULL);
   g_ptr_array_add (elements, videoflip);
+#endif
 
   if (needs_converters) {
     g_ptr_array_add (elements, gst_element_factory_make ("videoscale",
@@ -154,8 +156,10 @@ ges_video_source_create_filters (GESVideoSource * self, GPtrArray * elements,
 
   ges_track_element_add_children_props (trksrc, positioner, NULL, NULL,
       positioner_props);
+#if 0
   ges_track_element_add_children_props (trksrc, videoflip, NULL, NULL,
       videoflip_props);
+#endif
 
   self->priv->positioner = GST_FRAME_POSITIONNER (positioner);
   self->priv->positioner->scale_in_compositor =