Make IPv6 definitions comply with RFC 3493:

- Add some definitions to netinet/in6.h
 - Include netinet/in6.h from netinet/in.h

libc/include/netinet/in.h

@@ -32,6 +32,7 @@
 #include <linux/socket.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#include <netinet/in6.h>
 
 __BEGIN_DECLS
 
@@ -39,6 +40,9 @@ __BEGIN_DECLS
 
 extern int bindresvport (int sd, struct sockaddr_in *sin);
 
+static const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+static const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
+
 __END_DECLS
 
 #endif /* _NETINET_IN_H_ */

libc/include/netinet/in6.h

@@ -90,4 +90,12 @@
 
 #define INET6_ADDRSTRLEN 46
 
+#define IPV6_JOIN_GROUP IPV6_ADD_MEMBERSHIP
+#define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP
+
+#define IN6ADDR_ANY_INIT {{{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}}}
+
+#define ipv6mr_interface ipv6mr_ifindex
+
+
 #endif /* _NETINET_IN6_H */