[Perl/perl5] 5bb402: loc_tools: Generally return at least C locale

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 5bb402b5171850353df8e2f0e23826ee98b839ed
      
https://github.com/Perl/perl5/commit/5bb402b5171850353df8e2f0e23826ee98b839ed
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-01-16 (Tue, 16 Jan 2024)

  Changed paths:
    M t/loc_tools.pl

  Log Message:
  -----------
  loc_tools: Generally return at least C locale

If a category exists on the system, but we are supposed to keep it in
the C locale, it still is testable as C or POSIX.

Prior to this commit, it wasn't considered testable, and as a result
tests in our suite were wrongly skipped.