merge from trunk:

mod_proxy_connect: Fix high CPU loop on systems like UnixWare which
trigger POLL_ERR or POLL_HUP on a terminated connection.

PR 36951.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@306889 13f79535-47bb-0310-9956-ffa450edef68