message: Use a FastRandomContext in LimitOrphanTxSize
diff: @@ -779,10 +779,11 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
  nNextSweep = nMinExpTime + ORPHAN_TX_EXPIRE_INTERVAL;
  if (nErased > 0) LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx due to expiration\n", nErased);
  }
  + FastRandomContext rng;
  while (mapOrphanTransactions.size() > nMaxOrphans)
  {
  // Evict a random orphan:
  - uint256 randomhash = GetRandHash();
  + uint256 randomhash = rng.rand256();
  std::map<uint256, COrphanTx>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
  if (it == mapOrphanTransactions.end())
  it = mapOrphanTransactions.begin();
  