[Perl/perl5] abbd2f: Add PerlIO_readlink backcompat defines to Cws.xs

[Leon Timmermans via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: abbd2f4f4eac77962aadc53b540032162164678e
      
https://github.com/Perl/perl5/commit/abbd2f4f4eac77962aadc53b540032162164678e
  Author: Leon Timmermans <faw...@gmail.com>
  Date:   2022-03-04 (Fri, 04 Mar 2022)

  Changed paths:
    M dist/PathTools/Cwd.pm
    M dist/PathTools/Cwd.xs
    M dist/PathTools/lib/File/Spec.pm
    M dist/PathTools/lib/File/Spec/AmigaOS.pm
    M dist/PathTools/lib/File/Spec/Cygwin.pm
    M dist/PathTools/lib/File/Spec/Epoc.pm
    M dist/PathTools/lib/File/Spec/Functions.pm
    M dist/PathTools/lib/File/Spec/Mac.pm
    M dist/PathTools/lib/File/Spec/OS2.pm
    M dist/PathTools/lib/File/Spec/Unix.pm
    M dist/PathTools/lib/File/Spec/VMS.pm
    M dist/PathTools/lib/File/Spec/Win32.pm

  Log Message:
  -----------
  Add PerlIO_readlink backcompat defines to Cws.xs