Add a thin wrapper around the wayland dispatch code for no reason other than to add MESA_TRACE_FUNC so we can see where wayland dispatch delays are. Move this to loader so we can use it in the wayland egl code later. Signed-off-by: Derek Foreman <derek.foreman@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28634>