[Perl/perl5] 3e8103: libperl.t: remove the now obsolere skip on darwin

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 3e81034731d800130bf697e44c1732167a2fa5ef
      
https://github.com/Perl/perl5/commit/3e81034731d800130bf697e44c1732167a2fa5ef
  Author: Tony Cook <t...@develop-help.com>
  Date:   2023-07-04 (Tue, 04 Jul 2023)

  Changed paths:
    M t/porting/libperl.t

  Log Message:
  -----------
  libperl.t: remove the now obsolere skip on darwin