NET_SIZE_T is socklen_t on OpenBSD

PR:
Obtained from:
Submitted by:	Henning Brauer henning@openbsd.org
Reviewed by:	Jeff Trawick, Jim Jagielski


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@96751 13f79535-47bb-0310-9956-ffa450edef68