cogl/backend: Remove pre/post_parse
cogl/backend: Remove pre/post_parse

The CLUTTER_VBLANK environment variable is now handled in the common
code path.

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