fix windows build of test_file_storage

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8667 a83610d8-ad2a-0410-a6ab-fc0612d85776
fix upnp unit test

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8668 a83610d8-ad2a-0410-a6ab-fc0612d85776
some windows fixes for unit tests

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@8672 a83610d8-ad2a-0410-a6ab-fc0612d85776