[Perl/perl5] 31d0e1: locale.c: Remove unused #define

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 31d0e167dc33fbb39e61cb695650c798cf21f05c
      
https://github.com/Perl/perl5/commit/31d0e167dc33fbb39e61cb695650c798cf21f05c
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-12-11 (Mon, 11 Dec 2023)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c: Remove unused #define