[InterNetNews/inn] 45da51: Add a message for the pod2text --guesswork check

[Julien ÉLIE]

  Branch: refs/heads/2.7
  Home:   https://github.com/InterNetNews/inn
  Commit: 45da5188022d049adfaedae7ab831da9d54abed8
      https://github.com/InterNetNews/inn/commit/45da5188022d049adfaedae7ab831da9d54abed8
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-03-06 (Mon, 06 Mar 2023)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  Add a message for the pod2text --guesswork check

Otherwise, a mere "Unknown option: guesswork" appears
in Autoconf output.