* server/listen.c: Fix building on FreeBSD.

Tested on FreeBSD 5.4.  Seems to enable the accept filters correctly, for both HTTP and HTTPS.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/listen-protocol@171035 13f79535-47bb-0310-9956-ffa450edef68