message: Don't wipe the sigcache in TestBlockValidity
  coming from btc@69d373ff
diff: @@ -2418,7 +2418,8 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
  if (fCLTVIsActivated)
  flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
  - if (!CheckInputs(tx, state, view, fScriptChecks, flags, false, nScriptCheckThreads ? &vChecks : NULL))
  + bool fCacheResults = fJustCheck; /* Don't cache results if we're actually connecting blocks (still consult the cache, though) */
  + if (!CheckInputs(tx, state, view, fScriptChecks, flags, fCacheResults, nScriptCheckThreads ? &vChecks : NULL))
  return false;
  control.Add(vChecks);
  }
  