subrepo: make -S work again on Windows for incoming/outgoing to remote repos While it worked fine for the top level repo, the remote path for the subrepo got mangled to something like "https://server/prefix\repo\subrepo", which I've seen result in both a 400 and a 404, depending on the server. We need to `normpath` at least the `subpath` because of "http://user:***@localhost:$HGPORT/main/../sub" in `test-subrepo-relative-path.t`. Keep the `os.path` flavor for handling filesystem based remote repos, since this string is also displayed. This is one case where the automatic substitution of '\' for '/' and rematching done by the test runner is unfortunate- I don't see how to write a test to catch this. Differential Revision: https://phab.mercurial-scm.org/D11971