fix makefile issue

git-svn-id: http://libtorrent.googlecode.com/svn@10067 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
tag libtorrent 1.0

git-svn-id: http://libtorrent.googlecode.com/svn@10068 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda
branch for libtorrent 1.x

git-svn-id: http://libtorrent.googlecode.com/svn@10069 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda