message: fix compilation issues with old stdlib
diff: @@ -127,7 +127,7 @@ private:
  auto nested_name = nested.empty() || !use_nested_name
  ? name
  : nested.back().first + "::" + name;
  - nested.emplace_back(nested_name, 0);
  + nested.emplace_back(nested_name, std::chrono::steady_clock::duration{});
  start[nested_name] = std::chrono::steady_clock::now();
  }
  