Wayland backend doesn't handle WL_EVENT_WRITABLE
wl_event_loop_add_fd is not called with WL_EVENT_WRITABLE:
https://gitlab.freedesktop.org/wayland/weston/blob/master/libweston/compositor-wayland.c#L2789
However this is handled in wayland_backend_handle_event:
https://gitlab.freedesktop.org/wayland/weston/blob/master/libweston/compositor-wayland.c#L2605
Should we add WL_EVENT_WRITABLE to wl_event_loop_add_fd?
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