message: fix Realm JS windows build
diff: @@ -77,7 +77,7 @@ namespace util {
  // Note: Should conform with the future std::optional.
  template <class T>
  -class Optional : private _impl::OptionalStorage<T> {
  +class Optional : private realm::_impl::OptionalStorage<T> {
  public:
  using value_type = T;
  