Now that the dispatch function handles the entire request there's no need

Now that the dispatch function handles the entire request there's no need
to create a long lived pool, we can use one that's local to the function.

* modules/proxy/mod_proxy_fcgi.c
  (proxy_fcgi_baton_t): Removed.
  (dispatch): Use a local setaside pool instead of one from the baton.
  (proxy_fcgi_handler): Don't bother creating a baton.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/fcgi-proxy-dev@373269 13f79535-47bb-0310-9956-ffa450edef68