[PATCH v11 2/2] Add generic C.UTF-8 locale (Bug 17318)

[Florian Weimer]

* Carlos O'Donell:

> The locale is harmonized with locales already shipping in Gentoo,
> Debian, Ubuntu, Fedora, CentOS Stream, and RHEL. A new tst-iconv9 test
> is added which verifies the C.UTF-8 locale is generally usable.

One more nit, please aligned paragraph above with what's in NEWS.

Otherwise:

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian