message: Add missing make_span overload
diff: @@ -221,6 +221,13 @@ auto make_span(T& xs) -> span<detail::remove_reference_t<decltype(xs[0])>> {
  return {xs.data(), xs.size()};
  }
  +/// Convenience function to make using `caf::span` more convenient without the
  +/// deduction guides.
  +template <class T, size_t N>
  +span<T> make_span(T (&xs)[N]) {
  + return {xs, N};
  +}
  +
  /// Convenience function to make using `caf::span` more convenient without the
  /// deduction guides.
  template <class T>
  