add initial windows build bits for sofia-sip. This still needs the lib added to the build process and will not work with the stock sofia-sip tarball just yet. More commits to come.
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@2400 d0543943-73ff-0310-b7d9-9358b9ac24b2
