avformat: do not require frame_size for Speex.

Having it there forces decoding of a frame in order to get frame_size, but it
is not really needed for proper demuxing or decoding.

libavformat/utils.c

@@ -2070,7 +2070,6 @@ static int has_codec_parameters(AVCodecContext *avctx)
              avctx->codec_id == CODEC_ID_MP1 ||
              avctx->codec_id == CODEC_ID_MP2 ||
              avctx->codec_id == CODEC_ID_MP3 ||
-             avctx->codec_id == CODEC_ID_SPEEX ||
              avctx->codec_id == CODEC_ID_CELT))
             return 0;
         break;