Papa Roy said I could commit this. Fix USE_PTHREAD_SERIALIZED_ACCEPT, I

totally didn't do it right the first time.

Reviewed by:	Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79518 13f79535-47bb-0310-9956-ffa450edef68