Fix duplicate typedef of ClutterAlpha
Fix duplicate typedef of ClutterAlpha

Caught on OS X but not on my Fedora machine. Weird.

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