Forward port patch for CAN-2003-0253 from 2.0.

SECURITY [CAN-2003-0253]: Fixed a bug in prefork MPM causing
temporary denial of service when accept() on a rarely accessed port
returns certain errors.  Reported by Saheed Akhtar
<S.Akhtar@talis.com>.  [Jeff Trawick]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@100517 13f79535-47bb-0310-9956-ffa450edef68