Replace check_symlinks in the ap_sub_req_lookup_* calls with
  the new resolve_symlink (also used by the new directory_walk)
  especially for performance and readability.  Left check_symlinks
  in the soon-to-be-gone get_path_info flavor of directory_walk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89856 13f79535-47bb-0310-9956-ffa450edef68