Support MP3 audiostreams embedded in ASF containers.

Full credit to Igor Poretsky

Change-Id: I54769e33665cada1e1e0ef3a5511b56c8e1b859a

lib/rbcodec/metadata/metadata.h

@@ -316,6 +316,9 @@ struct mp3entry {
 
     /* Musicbrainz Track ID */
     char* mb_track_id;
+
+    /* For ASF files with MP3 audio stream */
+    bool is_asf_stream;
 };
 
 unsigned int probe_file_format(const char *filename);