message: Fix warning for PHP8
diff: @@ -160,7 +160,11 @@ void php_swoole_server_rshutdown() {
  swoole_error_log(SW_LOG_ERROR,
  SW_ERROR_PHP_FATAL_ERROR,
  "Fatal error: %s in %s on line %d",
  +#if PHP_VERSION_ID < 80000
  PG(last_error_message),
  +#else
  + PG(last_error_message)->val,
  +#endif
  PG(last_error_file) ? PG(last_error_file) : "-",
  PG(last_error_lineno));
  break;
  