need to link against advapi32 when using ed25519, since it needs entropy
need to link against advapi32 when using ed25519, since it needs entropy

git-svn-id: 6ed3528c1be4534134272ad6dd050eeaa1f628d3@8862 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk,svn2github/libtorrent-trunk