transcode: remove unused transcode_dequeue_all_pics

Pictures are now pushed towards the encoder directly and not queued for
encoding.

modules/stream_out/transcode/video.c

@@ -275,16 +275,6 @@ static void decoder_queue_video( decoder_t *p_dec, picture_t *p_pic )
     vlc_fifo_Unlock( id->output_fifo );
 }
 
-static vlc_picture_chain_t transcode_dequeue_all_pics( sout_stream_id_sys_t *id )
-{
-    vlc_picture_chain_t p_pics;
-    vlc_mutex_lock(&id->fifo.lock);
-    vlc_picture_chain_GetAndClear(&id->fifo.pic, &p_pics);
-    vlc_mutex_unlock(&id->fifo.lock);
-
-    return p_pics;
-}
-
 int transcode_video_init( sout_stream_t *p_stream, const es_format_t *p_fmt,
                           sout_stream_id_sys_t *id )
 {