video_output: avoids unused parameter warnings

modules/video_output/caca.c

@@ -411,6 +411,7 @@ static void Render( vout_thread_t *p_vout, picture_t *p_pic )
  *****************************************************************************/
 static void Display( vout_thread_t *p_vout, picture_t *p_pic )
 {
+    VLC_UNUSED(p_pic);
     caca_refresh_display( p_vout->p_sys->p_dp );
 }
 

modules/video_output/image.c

@@ -339,4 +339,5 @@ static void Display( vout_thread_t *p_vout, picture_t *p_pic )
 
 static void End( vout_thread_t *p_vout )
 {
+    VLC_UNUSED(p_vout);
 }