nested: Add EGL_WL_create_wayland_buffer_from_image compat defines
nested: Add EGL_WL_create_wayland_buffer_from_image compat defines

Make it possible to compile this example with EGL implementations without
this extension.

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