copy test_torrent_info unit test from libtorrent_aio

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9325 a83610d8-ad2a-0410-a6ab-fc0612d85776
improve duplicate file detection in torrent files

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9328 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix logging build

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@9330 a83610d8-ad2a-0410-a6ab-fc0612d85776