Use apr_uri_parse() instead of hand rolled parsing code in mod_dontdothat.

* tools/server-side/mod_dontdothat/mod_dontdothat:
  (is_this_legal): Don't reinvent the wheel.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1542069 13f79535-47bb-0310-9956-ffa450edef68