merged Steven Siloti's peer crypto patch into trunk

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10516 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fixed include

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10518 a83610d8-ad2a-0410-a6ab-fc0612d85776