RandomX: added Blake2 AVX2 version

+0.1% speedup on AMD Zen2/Zen3 and Intel CPUs which support AVX2.

src/crypto/rx/RxVm.cpp

@@ -25,11 +25,6 @@
 #include "crypto/rx/RxVm.h"
 
 
-#if defined(XMRIG_FEATURE_SSE4_1)
-extern "C" uint32_t rx_blake2b_use_sse41;
-#endif
-
-
 randomx_vm *xmrig::RxVm::create(RxDataset *dataset, uint8_t *scratchpad, bool softAes, const Assembly &assembly, uint32_t node)
 {
     int flags = 0;
@@ -51,10 +46,6 @@ randomx_vm *xmrig::RxVm::create(RxDataset *dataset, uint8_t *scratchpad, bool so
         flags |= RANDOMX_FLAG_AMD;
     }
 
-#   if defined(XMRIG_FEATURE_SSE4_1)
-    rx_blake2b_use_sse41 = Cpu::info()->has(ICpuInfo::FLAG_SSE41) ? 1 : 0;
-#   endif
-
     return randomx_create_vm(static_cast<randomx_flags>(flags), !dataset->get() ? dataset->cache()->get() : nullptr, dataset->get(), scratchpad, node);
 }