[Perl/perl5] efda6c: perl.h: Rmv duplicate #define

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: efda6cc7c5338d7c9a482ac31ca4166045338adf
      
https://github.com/Perl/perl5/commit/efda6cc7c5338d7c9a482ac31ca4166045338adf
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-09-10 (Sat, 10 Sep 2022)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Rmv duplicate #define

LOCALE_LOCK has already been defined in all circumstances earlier in the
file