[Perl/perl5] a2dfde: Add "run makedepend in parallel" to perldelta

[Max Maischein via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: a2dfde55580b6eed357b6e2cca478b0e82bf4056
      
https://github.com/Perl/perl5/commit/a2dfde55580b6eed357b6e2cca478b0e82bf4056
  Author: Max Maischein <cor...@corion.net>
  Date:   2021-08-14 (Sat, 14 Aug 2021)

  Changed paths:
    M pod/perldelta.pod

  Log Message:
  -----------
  Add "run makedepend in parallel" to perldelta