message: Turn SENDHEADERS on when a peer requests it.
diff: @@ -5250,14 +5250,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
  else if (strCommand == NetMsgType::SENDHEADERS)
  {
  LOCK(cs_main);
  - // BUIP010 Xtreme Thinblocks: We only do inv/getdata for xthinblocks and so we must have headersfirst turned off
  - if (IsThinBlocksEnabled())
  - State(pfrom->GetId())->fPreferHeaders = false;
  - else
  State(pfrom->GetId())->fPreferHeaders = true;
  }
  -
  else if (strCommand == NetMsgType::INV)
  {
  vector<CInv> vInv;
  