catch up with marco's repo

As much as possible, we should keep up to date with Marco's changes, even trivial ones like that. Or else, the day he makes changes that we really want to merge, we'll get a mess of merge conflicts, and won't be able to merge. Better resolve merge conflicts when they're small.

A more efficient way of working would be that Marco commits directly in official-stockfish (he has commit access)...

No functional change