fix windows build

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9764 a83610d8-ad2a-0410-a6ab-fc0612d85776
export ed25519 functions from libtorrent. fix tools/dht_put build when dht is disabled. fix shared linking in tools Jamfile

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9765 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fixes from RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9768 a83610d8-ad2a-0410-a6ab-fc0612d85776