mod_include now sets DOCUMENT_ARGS.

* Like DOCUMENT_URI, this is for the SSI document, not for any
  subrequest called for the include directive.
* Like QUERY_STRING, this is just r->args (or empty string if there are
  none), unlike QUERY_STRING_UNESCAPED.

The name of the variable is taken from the Zeus SSI implementation.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1734817 13f79535-47bb-0310-9956-ffa450edef68