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

Ludovic Courtès b5f8c2c885 hydra: Compute jobs in an inferior.		%!s(int64=6) %!d(string=hai) anos
..
evaluate.scm	65ff85dcee hydra: evaluate: Add the checkout to the store.	%!s(int64=6) %!d(string=hai) anos
gnu-system.scm	b5f8c2c885 hydra: Compute jobs in an inferior.	%!s(int64=6) %!d(string=hai) anos
guix-modular.scm	e740e8b27d hydra: guix-modular: Build the full Guix.	%!s(int64=6) %!d(string=hai) anos
guix.scm	df154c05dc hydra: Fix uses of 'eval-when'.	%!s(int64=7) %!d(string=hai) anos