[Perl/perl5] c1a957: perl.h - show HAS_STRTOLD if defined

[Yves Orton via perl5-changes]

  Branch: refs/heads/yves/hpux_build_warning_suppression
  Home:   https://github.com/Perl/perl5
  Commit: c1a9578fe9df817f46d34b056ed5826c502ac7da
      
https://github.com/Perl/perl5/commit/c1a9578fe9df817f46d34b056ed5826c502ac7da
  Author: Yves Orton <demer...@gmail.com>
  Date:   2023-03-25 (Sat, 25 Mar 2023)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h - show HAS_STRTOLD if defined

makes debugging easier