Revert "Sacrifice to the CPOSNonce gods, will they accept?"

This sacrifice was in vein.

This reverts commit f4c95fea7c.

src/primitives/block.h

@@ -28,15 +28,6 @@
 #include "uint256.h"
 #include "arith_uint256.h"
 
-class CPOSNonce : public uint256
-{
-public:
-    CPOSNonce() : uint256() { }
-    CPOSNonce(const base_blob<256> &b) : uint256(b) { }
-    CPOSNonce(const std::vector<unsigned char> &vch) : uint256(vch) { }
-};
-
-
 /** Nodes collect new transactions into a block, hash them into a hash tree,
  * and scan through nonce values to make the block's hash satisfy proof-of-work
  * requirements.  When they solve the proof-of-work, they broadcast the block
@@ -59,8 +50,8 @@ public:
     uint256 hashFinalSaplingRoot;
     uint32_t nTime;
     uint32_t nBits;
-    CPOSNonce nNonce;
-	//uint256 nNonce;
+    //CPOSNonce nNonce;
+	uint256 nNonce;
 
     std::vector<unsigned char> nSolution;