[InterNetNews/inn] c9de56: inews: Do not generate the Lines header field

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: c9de56ee65a39e787ebccf732cd862df124d0871
      https://github.com/InterNetNews/inn/commit/c9de56ee65a39e787ebccf732cd862df124d0871
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-02-19 (Sat, 19 Feb 2022)

  Changed paths:
    M doc/pod/news.pod
    M frontends/inews.c

  Log Message:
  -----------
  inews: Do not generate the Lines header field

This field is obsolescent and SHOULD NOT be generated per RFC 5536.

see #158