Stockfish 17070307c - new version!

Stockfish, chess engine UCI

Leader rating list JCER = 3353
🔬 Author: Marco Costalba 

Timestamp: 1499058407 

Don't uselessy share rootDepth 

It is not needed becuase the only case is a real special one (bench on depth with many threads) and can be easily rewritten to avoid sharing rootDepth. 

Verified with ThreadSanitizer. 
No functional change. 
Closes #1159 

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