Without this the git-fetch GEXP is run in an environment that uses ASCII
character encoding when strings are crossing the Guile - C boundary. It means
that e.g. tag names that have Unicode chars in them will cause problems,
e.g. when walking and deleting the .git directory.
An example in the wild: https://github.com/klauspost/pgzip/tags
Fixes <https://issues.guix.gnu.org/54893>.
* guix/git-download.scm (git-fetch): Call 'setenv' and 'setlocale' to
set it to en_US.utf8.
* gnu/packages/commencement.scm (glibc-utf8-locales-final): Make public.
Add 'properties' field.
Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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