* Make aliases more robust against potential traversal attacks, by using
  apr_filepath_merge to merge the real path and the remainder of the fake
  path like we do in the same situation for resources mapped by
  DocumentRoot.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1894024 13f79535-47bb-0310-9956-ffa450edef68
