fetchmail: Update to 6.4.12

pkgsrc changes:
---------------
  * Remove a conditional test for very old and unmaintained releases of
    NetBSD. The variable defined is this test seems to be absent from the
    pkgsrc tree and pkglint warns about its use.
  * Add a LICENSE to fetchmailconf

upstream changes:
-----------------
fetchmail-6.4.12 (released 2020-09-04, 27596 LoC):

# BUG FIXES:
* The README file is now the one from Git again. The makerelease.pl script
  used to roll and upload the tarball sometimes clobbered the README file and
  replaced its contents by a part of the NEWS file.

---------------------------------------------------------------------------------
fetchmail-6.4.11 (released 2020-08-28, 27596 LoC):

# REGRESSION FIX:
* configure: fetchmail 6.4.9 and 6.4.10 would miss checking for TLS v1.2 and
  TLS v1.3 support if AC_LIB_LINKFLAGS came up with something such as
  /path/to/libssl.so, rather than -lssl. (For instance on FreeBSD)

# KNOWN BUGS AND WORKAROUNDS
  (This section floats upwards through the NEWS file so it stays with the
  current release information)
* Fetchmail does not handle messages without Message-ID header well
  (See sourceforge.net bug #780933)
* Fetchmail currently uses 31-bit signed integers in several places
  where unsigned and/or wider types should have been used, for instance,
  for mailbox sizes, and misreports sizes of 2 GibiB and beyond.
  Fixing this requires C89 compatibility to be relinquished.
* BSMTP is mostly untested and errors can cause corrupt output.
* Fetchmail does not track pending deletes across crashes.
* The command line interface is sometimes a bit stubborn, for instance,
  fetchmail -s doesn't work with a daemon running.
* Linux systems may return duplicates of an IP address in some circumstances if
  no or no global IPv6 addresses are configured.
  (No workaround. Ubuntu Bug#582585, Novell Bug#606980.)
* Kerberos 5 may be broken, particularly on Heimdal, and provide bogus error
  messages. This will not be fixed, because the maintainer has no Kerberos 5
  server to test against. Use GSSAPI.

---------------------------------------------------------------------------------
fetchmail-6.4.10 (released 2020-08-27, 27596 LoC):

# REGRESSION FIX:
* configure: fetchmail 6.4.9's configure was unable to pick up OpenSSL
  if it wasn't announced by pkg-config, for instance, on FreeBSD.

---------------------------------------------------------------------------------
fetchmail-6.4.9: (not announced by e-mail, withdrawn)

## DOCUMENTATION UPDATE:
* manpage: mention that the SSL/TLS certificate fingerprint uses an MD5 hash.

## CHANGES:
* configure: try to use AC_LIB_LINKFLAGS to obtain proper link flags for
  libcrypto and libssl if pkg-config failed.
  This is an attempt to fix borderline issues when users building on systems
  with obsolete OpenSSL try to use a local newer OpenSSL from a separate
  directory.

## NEW TRANSLATION, with thanks to the translator:
* ro:    Florentina Mu��at [Romanian]


(triaxx)