bug#79118: CI test failures

Bruno Haible <[email protected]> writes:

> There are basically two ways to fix this:
>   (a) set the appropriate environment variables (instead of setlocale calls),
>   (b) add an nstrftime_l and fprintftime_l variant and pass a locale that
>       has "C" for the LC_TIME category.
>
> (b) is more hairy, when it comes to the "underlying strftime" delegation in
> gnulib/lib/strftime.c.
>
> Therefore here is a proposed fix according to (a). It fixes the test failures
> on macOS and OpenBSD. It also passes "make syntax-check".

Thanks for the patch. Interestingly, it passes macOS (cfarm104) but
fails on my OpenBSD VM.

Let me investigate some more...

Collin