bug#68794: git-annex accesses /etc/protocols

[Konrad Hinsen]

As packaged in Guix, git-annex reads the file /etc/protocols,
e.g. for accessing Web remotes. This requires sharing this
file from the host when running git-annex in a container.
Other software in Guix is patched to use the protocols file
from "net-base" instead. This should be done for git-annex
as well.

A quick scan of the source code shows no obvious reference to
/etc/protocols. It is possible that the access actually
happens in some dependency.

Cheers,
  Konrad.