macosx: fixed race condition crash when closing the vout

vout_display_opengl_Delete will call OpenglLock, so it is a bad idea to previously release sys->glView
(cherry picked from commit c6a264bf022d834e7617948e4923012fc1d8369d)

modules/video_output/macosx.m

@@ -266,11 +266,11 @@ void Close (vlc_object_t *this)
     [(id)sys->container performSelectorOnMainThread:@selector(release) withObject:nil waitUntilDone:NO];
     [sys->glView performSelectorOnMainThread:@selector(removeFromSuperview) withObject:nil waitUntilDone:NO];
 
-    [sys->glView release];
-
     if (sys->gl.sys != NULL)
         vout_display_opengl_Delete (sys->vgl);
 
+    [sys->glView release];
+
     if (sys->embed)
         vout_display_DeleteWindow (vd, sys->embed);
     free (sys);