We now have aarch64 build machines, but there wasn't one when 0.14.0 was
released. This means that if someone installs guix on aarch64 and tries
to run 'guix pull' then they have to build from the bootstrap binaries
to guix before pulling and then compiling HEAD.  I tried this myself on
Scaleway, which offers aarch64 VMs, and was met by test errors.

Also, for aarch64 at least, berlin.guixsd.org should be added to the
default substitute servers.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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