wayland: use wl_surface_damage_buffer

Since 2018, wl_surface_damage_buffer has been explicitly preferred and
recommended over wl_surface_damage*. mpv was still using the old
function in a couple of spots. The only difference is that we need to
pass buffer coordinates instead of surface coordinates. In vo_wlshm,
this is done by using vo->dwidth/vo->dheight since that is always used
whenever wl_buffers are created. In the case of the cursor surfaace, we
actually already passed buffer coordinates to it (img->width/height)
which was probablly technically wrong with wl_surface_damage, but it
doesn't really matter in practice. This requires bumping wl_compositor
to version 4 which is no problem since this dates back to 2015*.

https://gitlab.freedesktop.org/wayland/wayland/-/commit/921d0548035673a1bf6aeb9396b9bc728133411e
https://gitlab.freedesktop.org/wayland/wayland/-/commit/3384f69ecf043d62a4e036c0353c2daa01d7c4d0

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