compositor: Create surfaces neutral, select shader later
compositor: Create surfaces neutral, select shader later

We only setup the shader and create the texture once we attach a buffer
or set a color.

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