Resolve mod_autoindex caching problems by returning the mtime as the
  Last-Modified tag, and assigning the ETag.  Already applied to the
  Apache 2.0 tree.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@86813 13f79535-47bb-0310-9956-ffa450edef68