bug#54864: GNU Cuirass reports arm64 as armhf

[Maxim Cournoyer]

Hi Christopher,

[...]

> I see, yeah, I eventually figured out that aarch64 was what I was
> supposed to be using (I think I was reading
> https://wiki.debian.org/Multiarch/Tuples when I realized this).
>
> However, what confuses me still was that 'arm64-linux' did work as a
> system type: A bunch of packages failed to build, but some builds were
> successful. Maybe that input just makes it default to 'armhf-linux'?

I've had this experience before, it's very confusing (it goes on trying
to build a toolchain for something that is sure to fail).  Perhaps we
could at least have a place to refer to in the manual for the common GNU
triplets which make the most sense in for GNU Guix (e.g., the currently
supported GNU system triplets).  Currently I grep the manual for
disparate examples when my memory fail me.

Thanks,

Maxim