configure.in portability: need other headers for sockaddr_in6

[Jun-ichiro itojun Hagino]

	I think I have sent this before, but since it is not in 2.1.1p1
	I would like to resend.
	the following patch improves portability of configure.in script.
	netbsd build will choke without this.

itojun



$NetBSD: patch-aa,v 1.7 2000/05/31 15:32:44 itojun Exp $

--- configure.in	Tue May 30 11:57:47 2000
+++ configure.in	Wed May 31 18:31:52 2000
@@ -447,3 +447,5 @@
 		[
+#include <sys/types.h>
 #include <netinet/in.h>
+#include <sys/socket.h>
 		],
@@ -461,2 +463,3 @@
 		[
+#include <sys/types.h>
 #include <netinet/in.h>