Unbreak GtkClutterEmbed for Clutter >= 1.2
Unbreak GtkClutterEmbed for Clutter >= 1.2

Since Clutter got the support for INTEL_swap_events, clutter-gtk has
been broken because of the unhandled event driving the master clock.

One way to fix this is to let Clutter handle the events coming from GDK
using a filter function. We should actually move the whole event
handling there - since it's cleaner and more resilient to any further
change in the Clutter backends.

GNOME/clutter-gtk,GNOME/clutter-gtk,Distrotech/clutter-gtk,Distrotech/clutter-gtk,Distrotech/clutter-gtk