Portable VerusHash and CPU check

src/primitives/block.cpp

@@ -27,6 +27,15 @@ uint256 CBlockHeader::GetVerusHash() const
         return SerializeVerusHash(*this);
 }
 
+uint256 CBlockHeader::GetVerusHashPortable() const
+{
+    if (hashPrevBlock.IsNull())
+        // always use SHA256D for genesis block
+        return SerializeHash(*this);
+    else
+        return SerializeVerusHashPortable(*this);
+}
+
 uint256 CBlockHeader::GetVerusMiningHash() const
 {
     // no check for genesis block and use the optimized hash
@@ -43,6 +52,11 @@ void CBlockHeader::SetVerusHash()
     CBlockHeader::hashFunction = &CBlockHeader::GetVerusHash;
 }
 
+void CBlockHeader::SetVerusHashPortable()
+{
+    CBlockHeader::hashFunction = &CBlockHeader::GetVerusHashPortable;
+}
+
 uint256 CBlock::BuildMerkleTree(bool* fMutated) const
 {
     /* WARNING! If you're reading this because you're learning about crypto