[bug#29938] [PATCH] gnu: Add sound-juicer and it's dependencies.

[nee]

Happy gnu year everyone,
here are the patches for a very handy software for ripping audio CDs
(assuming I'll figure out how to configure git-send-email).

I tested it on GuixSD by ripping 4 music cds and it worked well with
it's usual quirks. If you want to test it keep in mind:
1. The CD must be mounted before you start sound-juicer.
2. When you switch the disc you should restart sound-juicer, or it might
not notice.