message: Make RewindBlockIndex interruptible
diff: @@ -4243,7 +4243,7 @@ bool CChainState::RewindBlockIndex(const CChainParams& params)
  CValidationState state;
  // Loop until the tip is below nHeight, or we reach a pruned block.
  - while (true) {
  + while (!ShutdownRequested()) {
  {
  LOCK(cs_main);
  // Make sure nothing changed from under us (this won't happen because RewindBlockIndex runs before importing/network are active)
  