configure: Only check for XCB if x11 compositor is enabled
configure: Only check for XCB if x11 compositor is enabled

eyolfson/weston,jonnylamb/weston,giucam/weston,Tarnyko/weston-xdg_surface_present,mchalupa/weston,kwm81/weston,udoprog/weston,mchalupa/weston,jonnylamb/weston,Fantu/compositor-spice,krezovic/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston,Gnurou/weston,Fantu/compositor-spice,Fantu/compositor-spice,Gnurou/weston,xorgy/weston,xorgy/weston,giucam/weston,kwm81/weston,krezovic/weston,sir-murray/weston,eyolfson/weston,sir-murray/weston