fix problem where sometimes VLCOpenGLES2VideoView has a different size than the superview.

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>
(cherry picked from commit 974b79d88ec564e86ab4137dd35aec941eca4338)

modules/video_output/ios2.m

@@ -146,6 +146,7 @@ static int Open(vlc_object_t *this)
 
     /* setup the actual OpenGL ES view */
     sys->glESView = [[VLCOpenGLES2VideoView alloc] initWithFrame:[viewContainer bounds]];
+    sys->glESView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
 
     if (!sys->glESView)
         goto bailout;