DNS Director: Include the necessary headers to build on FreeBSD too.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5064 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_dir_dns.c

@@ -43,6 +43,8 @@ SVNID("$Id$")
 #include <unistd.h>
 
 #include <stdio.h>
+#include <netinet/in.h>
+
 #include "cache.h"
 #include "cache_backend.h"
 #include "vrt.h"