bavier/guix: GNU Guix mirror with some of my own branches.

Ludovic Courtès 7082873ea2 bash completion: Restore completion of available packages for 'guix build'.		6 gadi atpakaļ
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bash	7082873ea2 bash completion: Restore completion of available packages for 'guix build'.	6 gadi atpakaļ
fish	4a78fd4617 Correct name and Email for ng0.	7 gadi atpakaļ
zsh	96dbc93089 Add Zsh completion file.	8 gadi atpakaļ