rev 1.248 of this file removed the default locking mechanism

from unixware 7.0.  instead it should have just defined
SINGLE_LISTEN_UNSERIALIZED_ACCEPT (since locking is always required for
multiple sockets).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@91856 13f79535-47bb-0310-9956-ffa450edef68