add ipv6 and icmpv6 to getprotoent-family functions

based on patch by orc.

src/network/proto.c

@@ -4,7 +4,7 @@
 /* do we really need all these?? */
 
 static int idx;
-static const unsigned char protos[][6] = {
+static const unsigned char protos[][8] = {
 	"\000ip",
 	"\001icmp",
 	"\002igmp",
@@ -13,6 +13,8 @@ static const unsigned char protos[][6] = {
 	"\014pup",
 	"\021udp",
 	"\026idp",
+	"\051ipv6",
+	"\072icmpv6",
 	"\377raw",
 	"\0\0"
 };