* clutter/osx/clutter-osx.h (_clutter_event_osx_put)
* clutter/osx/clutter-event-osx.c (clutter_event_osx_translate,
NSEvent:clutterStage:)
* clutter/osx/clutter-stage-osx.c (EVENT_HANDLER): Since events are
delivered to ClutterGLView, pass the associated ClutterStage directly
to event translation. Avoids relying on being embedded in
ClutterGLWindow, which makes it easier to implement clutter-gtk.