handle fact that lsockets aren't closed and reopened

across restarts, so there's a potential issue with a
socket being marked (still) as non-blocking.

PR:
Obtained from:
Submitted by:	Jeff
Reviewed by:	Jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@103284 13f79535-47bb-0310-9956-ffa450edef68