[Perl/perl5] eec417: locale.c Use macro to avoid conditionals

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: eec4172ad66d22cc508a1e12de1bb0a1930c11ee
      
https://github.com/Perl/perl5/commit/eec4172ad66d22cc508a1e12de1bb0a1930c11ee
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-01-10 (Wed, 10 Jan 2024)

  Changed paths:
    M locale.c

  Log Message:
  -----------
  locale.c Use macro to avoid conditionals

We know at compile time what these conditionals always evaluate to.  Use
a macro to replace the confitional with nothing when its always going to
be true.  (The section of code doesn't even get compiled when its going
to always be false.)