vs9/clutter.sln: Fix missing build item
vs9/clutter.sln: Fix missing build item

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