fcgistarter: Specify SO_REUSEADDR to allow starting a server

with old connections in TIME_WAIT.

Submitted by: trawick
Reviewed by: covener, sf


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1515367 13f79535-47bb-0310-9956-ffa450edef68