[InterNetNews/inn] b5ca9d: inews: Do not check From/Sender of cancel articles

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: b5ca9d04e571c24c7eeda4cddf9157df0cdfe532
      https://github.com/InterNetNews/inn/commit/b5ca9d04e571c24c7eeda4cddf9157df0cdfe532
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-02-19 (Sat, 19 Feb 2022)

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

  Log Message:
  -----------
  inews: Do not check From/Sender of cancel articles

inews was checking if the From or Sender header fields of a cancel or
supersede request matched the ones of the original article being withdrawn.
This check is inefficient and no longer encouraged by RFC 5537.

see #158