bug#63378: A single X-Debbugs-CC header must be used

[Maxim Cournoyer]

Hello,

Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> Fixes <https://issues.guix.gnu.org/63378>.
>
> * etc/teams.scm.in (cc): Adjust format pattern.
> (team->members, member->string): New procedures.
> (list-members): Refactor in terms of the above procedures.
> (main): Adjust the output of the 'cc-members-header-cmd' and
> 'cc-mentors-header-cmd' actions.

Paul from Debian has posted a merge request to the upstream Debbugs [0]
that would make it possible to use multiple X-Debbugs-CC.

Now, I don't think the GNU Debbugs instance is kept up-to-date with
Debbugs upstream, having its own set of changes, so I think the patch
here should still be applied in the meantime.

[0]  https://salsa.debian.org/debbugs-team/debbugs/-/merge_requests/18/diffs

-- 
Thanks,
Maxim