message: Fix for GCC-4.8
diff: @@ -11,7 +11,7 @@ unique_ptr<SQLStatement> Transformer::TransformCheckpoint(duckdb_libpgquery::PGN
  // transform into "CALL checkpoint()" or "CALL force_checkpoint()"
  auto result = make_unique<CallStatement>();
  result->function = make_unique<FunctionExpression>(checkpoint->force ? "force_checkpoint" : "checkpoint", children);
  - return result;
  + return move(result);
  }
  }
  