[Perl/perl5] 340e52: Document safesys...alloc fcns; safesysfree

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 340e526363979e280a7f5786a1249ada130b8a93
      
https://github.com/Perl/perl5/commit/340e526363979e280a7f5786a1249ada130b8a93
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-12-27 (Sun, 27 Dec 2020)

  Changed paths:
    M embed.fnc
    M util.c

  Log Message:
  -----------
  Document safesys...alloc fcns; safesysfree