Fixed VS2005 version of make_modem_filter

  Fixed a couple of places where declaration and definition of functions do not have the same calling conventions. Only relevant for Win32 compiles.


git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13831 d0543943-73ff-0310-b7d9-9358b9ac24b2