message: Replace platform dependent type with proper const
diff: bool SignalsOptInRBF(const CTransaction &tx)
  {
  for (const CTxIn &txin : tx.vin) {
  - if (txin.nSequence < std::numeric_limits<unsigned int>::max()-1) {
  + if (txin.nSequence <= MAX_BIP125_RBF_SEQUENCE) {
  return true;
  }
  }
  