merged encryption settings fix from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8376 a83610d8-ad2a-0410-a6ab-fc0612d85776
move hasher implementation out of header file

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8377 a83610d8-ad2a-0410-a6ab-fc0612d85776