[InterNetNews/inn] b9101a: nnrpd: Preserve initial dots in header field names

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: b9101a7db26fce0962158061eb787ba1c3ebb9ce
      https://github.com/InterNetNews/inn/commit/b9101a7db26fce0962158061eb787ba1c3ebb9ce
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-12-09 (Sat, 09 Dec 2023)

  Changed paths:
    M doc/pod/news.pod
    M nnrpd/post.c

  Log Message:
  -----------
  nnrpd: Preserve initial dots in header field names

They were wrongly stripped.

see #286