tag: added core support for the "album artist" tag

Added TAG_ITEM_ALBUM_ARTIST.

With this patch, MPD should be able to read the (inofficial)
"ALBUMARTIST" Vorbis comment.  Implementations in other decoder
plugins will follow soon.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/tag.h b/src/tag.h
index 7c7abf50..a3740881 100644
--- a/src/tag.h
+++ b/src/tag.h
@@ -29,6 +29,7 @@
 enum tag_type {
 	TAG_ITEM_ARTIST,
 	TAG_ITEM_ALBUM,
+	TAG_ITEM_ALBUM_ARTIST,
 	TAG_ITEM_TITLE,
 	TAG_ITEM_TRACK,
 	TAG_ITEM_NAME,