server: Drop struct wl_surface
server: Drop struct wl_surface

This struct was only defined in the server API for the purpose of the
input structs and helper functions.  Now that those are gone we can dro it.

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