cogl debug: Adds missing guards around debug cogl_args[]
cogl debug: Adds missing guards around debug cogl_args[]

commit 511e5ceb516dc accidentally removed the #ifdef COGL_ENABLE_DEBUG
guards around the "cogl-debug" and "cogl-no-debug" cogl_args[] which
this patch restores.

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