Set TCP_NODELAY in all the listening sockets

Maybe this should help latency a bit?  I don't have my testing setup
anymore, so, eh.

Author: lpereira

src/lib/lwan-socket.c

@@ -245,6 +245,8 @@ static int set_socket_options(const struct lwan *l, int fd)
     SET_SOCKET_OPTION(SOL_SOCKET, SO_LINGER,
                       (&(struct linger){.l_onoff = 1, .l_linger = 1}));
 
+    SET_SOCKET_OPTION_MAY_FAIL(SOL_TCP, TCP_NODELAY, (int[]){1});
+
 #ifdef __linux__
 
 #ifndef TCP_FASTOPEN