Fix IpV6 link local address connections

Paho currently successfully resolves IPv6 link-local addresses (of the
form `tcp://[xxxx::xxxx:xxxx:xxxx%eth0]:1883`). But it does not copy
the resolved link information over when attempting to make the
connection.

This is a 3-line fix.

See: #1464

src/Socket.c

@@ -1131,7 +1131,10 @@ int Socket_new(const char* addr, size_t addr_len, int port, SOCKET* sock)
 		{
 			address6.sin6_port = htons(port);
 			address6.sin6_family = family = AF_INET6;
-			memcpy(&address6.sin6_addr, &((struct sockaddr_in6*)(res->ai_addr))->sin6_addr, sizeof(address6.sin6_addr));
+			struct sockaddr_in6* res6 = (struct sockaddr_in6*)(res->ai_addr);
+			memcpy(&address6.sin6_addr, &res6->sin6_addr, sizeof(address6.sin6_addr));
+			memcpy(&address6.sin6_scope_id, &res6->sin6_scope_id, sizeof(address6.sin6_scope_id));
+			memcpy(&address6.sin6_flowinfo, &res6->sin6_flowinfo, sizeof(address6.sin6_flowinfo));
 		}
 		else
 #endif