Add app_fax from asterisk-addons, with some additional changes to resolve compiler

warnings, as well as update to the APIs in spandsp 0.0.5.  Spandsp 0.0.5 is being
distributed under the LGPL, so we can move this module into the main tree.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@119801 65c4cc65-6c06-0410-ace0-fbb531ad65f3