Stockfish 17081508 - nowa kompilacja!

Stockfish, silnik szachowy UCI

Ranking JCER=3331
🔬 Autor: Marco Costalba

More:
Timestamp: 1502776918 

Fix incorrect StateInfo 

We use Position::set() to set root position across threads. But there are some StateInfo fields (previous, pliesFromNull, capturedPiece) that cannot be deduced from a fen string, so set() clears them and to not lose the info we need to backup and later restore setupStates->back(). 
Note that setupStates is shared by threads but is accessed 
in read-only mode. 

This fixes regression introduced by df6cb446eaf21 

Tested with 3 threads at STC: 
LLR: 2.95 (-2.94,2.94) [-4.00,0.00] 
Total: 14436 W: 2304 L: 2196 D: 9936 

Bench: 5608839 

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