[InterNetNews/inn] 85faef: archivegz: Migrate from newgetopt.pl to Getopt::Long

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 85faefd5d426db751e5db4c534ad092d7608562d
      https://github.com/InterNetNews/inn/commit/85faefd5d426db751e5db4c534ad092d7608562d
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-01-26 (Thu, 26 Jan 2023)

  Changed paths:
    M contrib/archivegz.in

  Log Message:
  -----------
  archivegz: Migrate from newgetopt.pl to Getopt::Long

This script was no longer working on modern versions of Perl,
due to its use of newgetopt.pl and newusage.pl.  Convert it
to use Getopt::Long instead.