libweston: remove output_pending_signal

The signal has been replaced with the heads_changed hook and is no
longer useful.

weston_pending_output_coldplug() is renamed to
weston_compositor_flush_heads_changed() for two reasons: it better
describes what it does now, and it serves as an obvious flag that
libweston ABI has been broken.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>

compositor/main.c

@@ -1943,7 +1943,7 @@ int main(int argc, char *argv[])
 		goto out;
 	}
 
-	weston_pending_output_coldplug(ec);
+	weston_compositor_flush_heads_changed(ec);
 	if (user_data.init_failed)
 		goto out;