GNU/Hurd support on core-updates

[Ludovic Courtès]

Hello Manolis,

I had almost forgotten about it (!), but ‘core-updates’ adds support for
Guix on native GNU/Hurd, via commit
d75acc293dd3e63db8739aa04c021df917aa1b80.

Do I get it right that, on current core-updates, we have (1)
cross-compilation support to i586-pc-gnu(?), and (2) native support
works and all we need is to provide the bootstrap binaries?

If so, I’d like to add cross-compilation jobs on Hydra to catch any
regressions, and address (2) by providing the bootstrap binaries that
you built on ftp://alpha.gnu.org and such.

TIA!  :-)

Ludo’.