client: remove two unused function pointer typedefs
client: remove two unused function pointer typedefs

The need for wl_display_update_func_t was removed in

commit 53d24713a31d59d9534c1c1a84a7ad46f44ee95f
Author: Kristian Høgsberg <krh@bitplanet.net>
Date:   Thu Oct 4 16:54:22 2012 -0400

    Change filedescriptor API to be thread safe

and wl_callback_func_t does not seem to have ever been used in the first place.

Signed-off-by: Pekka Paalanen <6c0263d81461c956d504307112a4ce25eaacc3d1@gmail.com>

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