Added config option for AVX2 dataset init

-1 = Auto detect
0 = Always disabled
1 = Enabled if AVX2 is supported

src/crypto/randomx/randomx.h

@@ -170,6 +170,7 @@ void randomx_apply_config(const T& config)
 
 void randomx_set_scratchpad_prefetch_mode(int mode);
 void randomx_set_huge_pages_jit(bool hugePages);
+void randomx_set_optimized_dataset_init(int value);
 
 #if defined(__cplusplus)
 extern "C" {