scmutil: don't try to delete origbackup symlinks to directories (issue5731) When origbackuppath is set, when looking to see if a file we are backing up conflicts with a directory in the origbackuppath, we incorrectly match on symlinks to directories. This means we try to call vfs.rmtree on the symlink, which fails. Differential Revision: https://phab.mercurial-scm.org/D1311