[Perl/perl5] e38e5c: locale.c: Move setting errno out of critical section

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: e38e5c71ea2260e88d7c7c9729f9d5893a989fbf
      
https://github.com/Perl/perl5/commit/e38e5c71ea2260e88d7c7c9729f9d5893a989fbf
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-07-16 (Sun, 16 Jul 2023)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Move setting errno out of critical section

I doesn't matter much, but its better practice to make critical sections
as small as possible.