message: [Trivial] Compiler warnings over the overrided methods fix.
diff: @@ -117,8 +117,8 @@ protected:
  public:
  TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn) : txTo(txToIn), nIn(nInIn) {}
  - bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const;
  - bool CheckLockTime(const CScriptNum& nLockTime) const;
  + bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const override;
  + bool CheckLockTime(const CScriptNum& nLockTime) const override;
  bool CheckColdStake(const CScript& script) const override {
  return txTo->CheckColdStake(script);
  }
  