Bump liberty, enable TLS SNI

Involves some rewrites to fit the new APIs.

SNI has been implemented Mostly just because we can, I don't think it's
widely in use and kike doesn't support this feature of the protocol either.

kike.c

@@ -3385,6 +3385,7 @@ irc_try_fetch_client (struct server_context *ctx, int listen_fd)
 		return true;
 	}
 
+	// FIXME: use async_getnameinfo() so that we never ever block here
 	char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
 	int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
 		host, sizeof host, port, sizeof port, NI_NUMERICSERV);