message: Fix sled_transaction test to run without alter-table feature
diff: @@ -344,6 +344,7 @@ async fn sled_transaction_gc() {
  exec!(glue1 "CREATE INDEX idx_id ON Garlic (id);");
  exec!(glue1 "INSERT INTO Garlic VALUES (1), (2);");
  exec!(glue1 "CREATE INDEX idx_gc ON Garlic (id + 2);");
  + #[cfg(feature = "alter-table")]
  exec!(glue1 "ALTER TABLE Garlic ADD COLUMN num INTEGER NULL;");
  assert_some!();
  exec!(glue1 "COMMIT;");
  