mod_proxy_fcgi: forcing proxy_conn->close here is useless, same is done

either above in ap_proxy_determine_connection(), or below in
ap_proxy_release_connection().



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1756187 13f79535-47bb-0310-9956-ffa450edef68