message: Fix port->set() dtls compile error
diff: @@ -508,9 +508,11 @@ static PHP_METHOD(swoole_server_port, set) {
  if (php_swoole_array_get_value(vht, "ssl_protocols", ztmp)) {
  zend_long v = zval_get_long(ztmp);
  port->ssl_context->protocols = v;
  +#ifdef SW_SUPPORT_DTLS
  if (port->is_dtls() && !port->is_dgram()) {
  port->ssl_context->protocols ^= SW_SSL_DTLS;
  }
  +#endif
  }
  if (php_swoole_array_get_value(vht, "ssl_verify_peer", ztmp)) {
  port->ssl_context->verify_peer = zval_is_true(ztmp);
  