window: Ignore input_set_pointer_image() if we don't have a pointer
window: Ignore input_set_pointer_image() if we don't have a pointer

https://bugs.freedesktop.org/show_bug.cgi?id=55782

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