lilypond 2.19.80

[Mason Hock]

The current version of lilypond in Guix is 2.19.63, and it looks like 
its source is downloads.linuxaudio.org

https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/music.scm?id=v0.14.0-407-gc521c8f1a#n810
but the latest version at downloads.linuxaudio.org is 2.19.80

http://download.linuxaudio.org/lilypond/source/v2.19/

When will Guix be updated to reflect this?

Thanks,

Mason