[NEW] audio/p5-MusicBrainz-DiscID-0.0.4 for audio/abcde

Hi,

I'm proposing this XS Perl module, because it will be required in order
to update audio/abcde to its latest release.

From DESCR:

MusicBrainz::DiscID is a Perl class to calculate a MusicBrainz DiscID
from an audio CD in the drive.

Homepage: http://search.cpan.org/dist/MusicBrainz-DiscID/

It builds and works on amd64, but i have no other architecture to
test against, so testing and comments are welcome!

I'm also joining a small test script that gives you a link to the
MusicBrainz' table of content of the currently inserted audio CD.

Charlène.