separate the configuration of crypto library and whether protocol encryption is enabled or not. make protocol encryption always use the built-in rc4 and tommath code. SHA-1 hashing is done by the crypto library

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10643 a83610d8-ad2a-0410-a6ab-fc0612d85776
regenerate html

git-svn-id: http://svn.code.sf.net/p/libtorrent/code/trunk@10644 a83610d8-ad2a-0410-a6ab-fc0612d85776