scanner: Emit wl_*_destroy stub even if interface has a destructor
scanner: Emit wl_*_destroy stub even if interface has a destructor

If an interface has a destructor but no 'destroy' method we used to
not emit a destroy method.  Now with the fix for missing destroy
requests for wl_pointer etc we need to emit the local wl_*_destroy
always.

eyolfson/wayland,mchalupa/wayland,mchalupa/wayland,tulcod/wayland,bitfactor/wayland,abooij/wayland,eyolfson/wayland,bitfactor/wayland,abooij/wayland,sir-murray/wayland,tulcod/wayland,abooij/wayland,sir-murray/wayland,eyolfson/wayland,mchalupa/wayland,tulcod/wayland,sir-murray/wayland,bitfactor/wayland