window: fix missing prototypes warning

Declare touch_handle_shape and touch_handle_orientation as static
functions as they are local to window.c.

Signed-off-by: Guillaume Champagne <champagne.guillaume.c@gmail.com>

clients/window.c

@@ -3436,13 +3436,15 @@ touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 	}
 }
 
-void touch_handle_shape(void *data, struct wl_touch *wl_touch, int32_t id,
-			 wl_fixed_t major, wl_fixed_t minor)
+static void
+touch_handle_shape(void *data, struct wl_touch *wl_touch, int32_t id,
+			wl_fixed_t major, wl_fixed_t minor)
 {
 }
 
-void touch_handle_orientation(void *data, struct wl_touch *wl_touch, int32_t id,
-			       wl_fixed_t orientation)
+static void
+touch_handle_orientation(void *data, struct wl_touch *wl_touch, int32_t id,
+			wl_fixed_t orientation)
 {
 }