message: Remove duplicated define
diff: @@ -69,8 +69,6 @@ public:
  void SetCommitment(const secp_primitives::GroupElement& v);
  void Generate(const SigmaPrivateKey& pkey);
  - bool operator==(const SigmaPublicKey& another) const { return commitment == another.commitment; }
  -
  ADD_SERIALIZE_METHODS;
  template <typename Stream, typename Operation>
  