Log Message:
Update tnef to 1.4.12:

* 1.4.12 [31 August 2014]
** Fixing bug in distribution tarball.
*** https://github.com/verdammelt/tnef/issues/9
** Fixing autoconf warnings
*** https://github.com/verdammelt/tnef/issues/4
*** https://github.com/verdammelt/tnef/pull/10
** Fixing compilation warning on Fedora
*** https://github.com/verdammelt/tnef/pull/8

* 1.4.11 [12 July 2014]
** Fixing bug when parsing files with multiple value MAPI attributes
*** https://github.com/verdammelt/tnef/issues/3
** Fixing compilation warnings
*** https://github.com/verdammelt/tnef/issues/5

* 1.4.10 [4 November 2013]
** Incorporating documentation patch from bentley (github)
** Fixing small problems from new versions of automake/gcc

* 1.4.9 [29 February 2012]
** Incorporating patches from Engelke Eschner <tekai@gmx.li>
*** (from github: https://github.com/verdammelt/tnef/pull/1)
*** Fixing some memory leaks
*** printing out MIME types

* 1.4.8 [18 April 2011]
** Switched to Git
** Applied patch for man page from Jari Aalto [patch #3104753]

* 1.4.7 [31 January 2010]
** Reverting to older UTF decoding method.  The public domain UTF converter
   I replaced my buggy/wrong version with was itself buggy and wrong it seems
   (didn't work on some platforms).
** Updating main copyright date notice.

* 1.4.6 [25 August 2009]
** Including patch from Randy Diffenderfer for a variety of fixes & tweaks.
** Replacing my buggy/wrong UTF converter code with public domain UTF converter code.

* 1.4.5 [28 Sept 2008]
** Fixing bug when reading from stdin [Bug #2126695]

* 1.4.4 [29 May 2008]
** Small updates after long absense
** Adding --ignore-checksum feature.