[Perl/perl5] 041cf0: locale.c: Use buffer instead of SAVEFREEPV

[Karl Williamson via perl5-changes]

  Branch: refs/heads/smoke-me/khw-win_savefreepv
  Home:   https://github.com/Perl/perl5
  Commit: 041cf007d6a5cc7073ba3cc61ef9f579264f543b
      
https://github.com/Perl/perl5/commit/041cf007d6a5cc7073ba3cc61ef9f579264f543b
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-10-21 (Fri, 21 Oct 2022)

  Changed paths:
    M embedvar.h
    M intrpvar.h
    M locale.c
    M makedef.pl
    M sv.c

  Log Message:
  -----------
  locale.c: Use buffer instead of SAVEFREEPV

This eliminates the use of temporaries here, as long suggested to do by
the comments