IRIX defines IPV6_VERSION in <netinet/in.h>, and we don't use it, so

remove the definition from ip6.h, to get rid of compiler warnings.

Author: yuguy

ip6.h

@@ -1,4 +1,4 @@
-/* @(#) $Header: /tcpdump/master/tcpdump/ip6.h,v 1.6 2002-12-11 22:29:21 guy Exp $ (LBL) */
+/* @(#) $Header: /tcpdump/master/tcpdump/ip6.h,v 1.6.4.1 2005-04-20 10:04:37 guy Exp $ (LBL) */
 /*	$NetBSD: ip6.h,v 1.9 2000/07/13 05:34:21 itojun Exp $	*/
 /*	$KAME: ip6.h,v 1.9 2000/07/02 21:01:32 itojun Exp $	*/
 
@@ -95,9 +95,6 @@ struct ip6_hdr {
 #define ip6_hlim	ip6_ctlun.ip6_un1.ip6_un1_hlim
 #define ip6_hops	ip6_ctlun.ip6_un1.ip6_un1_hlim
 
-#define IPV6_VERSION		0x60
-#define IPV6_VERSION_MASK	0xf0
-
 /* in network endian */
 #define IPV6_FLOWINFO_MASK	((u_int32_t)htonl(0x0fffffff))	/* flow info (28 bits) */
 #define IPV6_FLOWLABEL_MASK	((u_int32_t)htonl(0x000fffff))	/* flow label (20 bits) */