fix openssl build

git-svn-id: http://libtorrent.googlecode.com/svn@9970 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
INT16_MIN and INT16_MAX macros for windows

git-svn-id: http://libtorrent.googlecode.com/svn@9971 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda