message: Padd the coinbase to be at least 100 bytes only after fork activation.
  Previously it was enabled already by default.
diff: @@ -168,7 +168,7 @@ CTransactionRef BlockAssembler::coinbaseTx(const CScript &scriptPubKeyIn, int _n
  // Make sure the coinbase is big enough.
  uint64_t nCoinbaseSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
  - if (nCoinbaseSize < MIN_TX_SIZE)
  + if (nCoinbaseSize < MIN_TX_SIZE && IsNov152018Enabled(Params().GetConsensus(), chainActive.Tip()))
  {
  tx.vin[0].scriptSig << std::vector<uint8_t>(MIN_TX_SIZE - nCoinbaseSize - 1);
  }
  