wayland: Listen to output changes

src/wayland.c

@@ -10,3 +10,8 @@ void
 eek_virtual_keyboard_v1_key(struct zwp_virtual_keyboard_v1 *zwp_virtual_keyboard_v1, uint32_t time, uint32_t key, uint32_t state) {
     zwp_virtual_keyboard_v1_key(zwp_virtual_keyboard_v1, time, key, state);
 }
+
+int squeek_output_add_listener(struct wl_output *wl_output,
+                                const struct wl_output_listener *listener, void *data) {
+    return wl_output_add_listener(wl_output, listener, data);
+}