x11: Fix typo in clutter_x11_set_use_argb_visual() declaration
x11: Fix typo in clutter_x11_set_use_argb_visual() declaration

The function should have a lowercase x11, not an uppercase X11 in its
name.

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