message: Fix MacOS build issue (Pair is ambiguous)
diff: @@ -186,7 +186,7 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry)
  }
  }
  if (tx.nVersion >= 3 && tx.nType != TRANSACTION_NORMAL) {
  - entry.push_back(Pair("extraPayLoadSize", tx.vExtraPayload.size()));
  + entry.push_back(Pair("extraPayLoadSize", (int)tx.vExtraPayload.size()));
  entry.push_back(Pair("extraPayLoad", HexStr(tx.vExtraPayload.begin(), tx.vExtraPayload.end())));
  }
  }
  