actor-box: Correctly clamp to pixel
actor-box: Correctly clamp to pixel

Use ceilf() to round up the right side of the actor's box, and floorf()
to round down the left side.

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