cogl: Add deprecation annotation to CoglMaterial ref/unref
cogl: Add deprecation annotation to CoglMaterial ref/unref

The G_GNUC_DEPRECATED annotation was missing from the material ref and
unref functions.

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