AstroBWT 20-50% speedup

Skips hashes with large stage 2 size. Added configurable `astrobwt-max-size` parameter, default value is 550, min 400, max 1200, optimal value ranges from 500 to 600 depending on CPU.

- Intel CPUs get 20-25% speedup
- 1st- and 2nd-gen Ryzens get 30% speedup
- 3rd-gen Ryzens get up to 50% speedup

src/crypto/astrobwt/AstroBWT.h

@@ -34,6 +34,7 @@ struct cryptonight_ctx;
 
 namespace xmrig { namespace astrobwt {
 
+bool astrobwt_dero(const void* input_data, uint32_t input_size, void* scratchpad, uint8_t* output_hash, int stage2_max_size);
 
 template<Algorithm::Id ALGO>
 void single_hash(const uint8_t* input, size_t size, uint8_t* output, cryptonight_ctx** ctx, uint64_t);