egl/x11: Defer X11-specific code to the X11 backend
egl/x11: Defer X11-specific code to the X11 backend

The ClutterStageX11 implementation does most of the heavy lifting, so
subclasses like ClutterStageGLX and ClutterStageEGL do not need to
handle things like creating the stage Window and selecting events; just
chaining up and using the internal API will suffice.

Distrotech/clutter,collects/clutter,dlespiau/clutter,nobled/clutter,nobled/clutter,ebassi/clutter,heysion/clutter-clone,collects/clutter,djdeath/clutter,dlespiau/clutter,djdeath/clutter,djdeath/clutter-multithreaded,jigpu/clutter,collects/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,djdeath/clutter,djdeath/clutter-multithreaded,collects/clutter,heysion/clutter-clone,heysion/clutter-clone,djdeath/clutter,collects/clutter,ebassi/clutter,spatulasnout/clutter,jigpu/clutter,kerrickstaley/clutter-vala,djdeath/clutter-android,Distrotech/clutter,djdeath/clutter-android,GNOME/clutter,jigpu/clutter,nobled/clutter,djdeath/clutter-android,dlespiau/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,djdeath/clutter-multithreaded,ebassi/clutter,heysion/clutter-clone,GNOME/clutter,ebassi/clutter,Distrotech/clutter,djdeath/clutter,jigpu/clutter,djdeath/clutter,GNOME/clutter,djdeath/clutter-android,Distrotech/clutter,ebassi/clutter,spatulasnout/clutter,kerrickstaley/clutter-vala,jigpu/clutter,GNOME/clutter,spatulasnout/clutter,spatulasnout/clutter,Distrotech/clutter,djdeath/clutter-android,heysion/clutter-clone,jigpu/clutter,djdeath/clutter-multithreaded,GNOME/clutter