/*
* Get the ordinal (list position) of an item in a list.
*
* Normally used to retrieve the track number out of a list of tracks in
* an album.
*
* Aliases:
* MusicBrainz::Client#get_ordinal
* MusicBrainz::Client#get_ordinal_from_list
*
* Examples:
* # get the ordinal of a track based on the URI
* list = mb.result MusicBrainz::Query::AlbumGetTrackList
* uri = mb.result MusicBrainz::Query::AlbumGetTrackId, 5
* ordinal = mb.ordinal list, uri
*
*/
static VALUE mb_client_ordinal(VALUE self, VALUE list, VALUE uri) {