Log Message:
Update to 1.11.10 (2013).  Notable changes:

- Performance optimization, reported by Gary R. Schmidt.
- Fix a file descriptor leak in fetchnews.c's getbody_newno function
- When complaining that we are unable to switch the user ID, report the
  current real and effective user IDs to ease debugging.

- Leafnode now enables IPv6 support by default. Use --without-ipv6 to disable.
- Leafnode now supports detecting if a peer is in a local network also
  for IPv6 global addresses, providing that the host OS provides getifaddrs().
  This comprises Linux, NetBSD, FreeBSD, but not, for instance, Solaris 10.