Replace XserverRegion with xcb_xfixes_region_t

Signed-off-by: Uli Schlachter <psychon@znc.in>

src/x.h

@@ -84,7 +84,7 @@ x_create_picture(session_t *ps, int wid, int hei,
   const xcb_render_create_picture_value_list_t *attr);
 
 /// Fetch a X region and store it in a pixman region
-bool x_fetch_region(session_t *ps, XserverRegion r, region_t *res);
+bool x_fetch_region(session_t *ps, xcb_xfixes_region_t r, region_t *res);
 
 void x_set_picture_clip_region(session_t *ps, xcb_render_picture_t,
   int clip_x_origin, int clip_y_origin, const region_t *);