compositor: Combine repaint and weston_output_repaint
compositor: Combine repaint and weston_output_repaint

Fewer repaint functions is better.

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