fix fmtp pass through in pass through mode for amr and g729, add pass through mode for mod_amr, and add mod_amr to the windows build (in pass through mode)  To build mod_amr in NON pass through mode you must now have the lib in libs/amr dir in your src tree.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4381 d0543943-73ff-0310-b7d9-9358b9ac24b2