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This commit address two issues with sockaddr struct implementations for IPv6: 1) struct sockaddr_in6 should have 32-bit unsigned field sin6_scope_id as specified in Section 3.4 of RFC 3493 (Basic Socket Interface Extensions for IPv6) 2) struct sockaddr is not extended in IPv6 to contain space for struct sockaddr_in6. Applications should be using struct sockaddr_storage when needing generic storage. This removes the extra bytes added when LWIP_IPV6 is defined