[InterNetNews/inn] 78d7e2: Actually remove deprecated innd -C flag

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 78d7e2430e4ab0533b3ea978a7ff4c2f6f4b32ef
      https://github.com/InterNetNews/inn/commit/78d7e2430e4ab0533b3ea978a7ff4c2f6f4b32ef
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-07-10 (Sun, 10 Jul 2022)

  Changed paths:
    M innd/innd.c

  Log Message:
  -----------
  Actually remove deprecated innd -C flag

innd no longer accepts the -C flag, deprecated since INN 2.7.0 in favour of
the docancels parameter in inn.conf.  An error message was logged since then.

closes #227