[Perl/perl5] f5ce97: locale.c: Remove redundant lock

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: f5ce970024177e5942f19cffe24a19fde76a0397
      
https://github.com/Perl/perl5/commit/f5ce970024177e5942f19cffe24a19fde76a0397
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-01-30 (Tue, 30 Jan 2024)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Remove redundant lock

This is a relic from a past implementation.  The operation is locked by
the gwLOCALE_LOCK macro just below, so this is redundant.