Add Speex in flv demuxing support. #2973

However, it only works with the avcodec module. --codec avcodec if you want it.

modules/codec/avcodec/fourcc.c

@@ -389,6 +389,7 @@ static const struct
 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 6, 0 )
     { VLC_CODEC_QCELP, CODEC_ID_QCELP, AUDIO_ES },
 #endif
+    { VLC_CODEC_SPEEX, CODEC_ID_SPEEX, AUDIO_ES },
 
     /* PCM */
     { VLC_CODEC_S8, CODEC_ID_PCM_S8, AUDIO_ES },