cmake file fix

git-svn-id: http://libtorrent.googlecode.com/svn@10028 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
first pass at transitioning over to boost::crono

git-svn-id: http://libtorrent.googlecode.com/svn@10029 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
attempt transitioning over to chrono based asio timers + build fixes

git-svn-id: http://libtorrent.googlecode.com/svn@10030 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda