message: txindex: Remove unused boost/thread
diff: #include <util/translation.h>
  #include <validation.h>
  -#include <boost/thread.hpp>
  -
  constexpr char DB_BEST_BLOCK = 'B';
  constexpr char DB_TXINDEX = 't';
  constexpr char DB_TXINDEX_BLOCK = 'T';
  @@ -127,7 +125,6 @@ bool TxIndex::DB::MigrateData(CBlockTreeDB& block_tree_db, const CBlockLocator&
  bool interrupted = false;
  std::unique_ptr<CDBIterator> cursor(block_tree_db.NewIterator());
  for (cursor->Seek(begin_key); cursor->Valid(); cursor->Next()) {
  - boost::this_thread::interruption_point();
  if (ShutdownRequested()) {
  interrupted = true;
  break;
  