Silence some compiler warnings
Silence some compiler warnings

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