Add a rev to the proposed backport (discussed with proposer), add a minus 0,
but only because I've felt the pain of filtered ICMP, window scaling and broken
firewalls.  



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@280403 13f79535-47bb-0310-9956-ffa450edef68