That would affect also non-Hurd cross-compilation targets, but if it
works, it’s simpler.

Then, as a second step, we could prepare a ‘core-packages-team’ branch
that upgrades ‘gcc’ globally, and that way we keep something consistent
and simpler, without ‘current-gcc’.  (Though it means we’d have to wait
before we can build natively on x86_64-gnu.)

WDYT?

Ludo’.