Use AI_ADDRCONFIG for name lookups by default.  Don't send this upstream
as-is since it needs an autoconf test to check whether AI_ADDRCONFIG is safe
to use in getaddrinfo calls (it isn't in the RHL6.2 resolver, for instance).

--- fetchmail-6.2.5/socket.c.addrconf	2003-10-10 11:32:15.000000000 +0100
+++ fetchmail-6.2.5/socket.c	2004-05-19 13:23:22.000000000 +0100
@@ -276,6 +276,9 @@
 #endif /* HAVE_SOCKETPAIR */
     memset(&req, 0, sizeof(struct addrinfo));
     req.ai_socktype = SOCK_STREAM;
+#ifdef AI_ADDRCONFIG
+    req.ai_flags = AI_ADDRCONFIG;
+#endif
 
     if (getaddrinfo(host, service, &req, &ai0)) {
 	report(stderr, GT_("fetchmail: getaddrinfo(%s.%s)\n"), host,service);