[Perl/perl5] 68ad61: perl.h: Fix typos in conditional macro names

[TAKAI Kousuke via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 68ad61f5afbf1b95e3717e314a9204b5689471c7
      
https://github.com/Perl/perl5/commit/68ad61f5afbf1b95e3717e314a9204b5689471c7
  Author: TAKAI Kousuke <62541129+t-...@users.noreply.github.com>
  Date:   2021-01-14 (Thu, 14 Jan 2021)

  Changed paths:
    M perl.h

  Log Message:
  -----------
  perl.h: Fix typos in conditional macro names