Remove no longer needed cleanup code

Author: jstasiak

src/cargo/ops/cargo_clean.rs

@@ -175,9 +175,6 @@ pub fn clean(ws: &Workspace<'_>, opts: &CleanOptions<'_>) -> CargoResult<()> {
                     // TODO: what to do about build_script_build?
                     let incremental = layout.incremental().join(format!("{}-*", crate_name));
                     rm_rf_glob(&incremental, config)?;
-                    if let Some(uplift_dir) = uplift_dir {
-                        rm_rf(&uplift_dir.join("CACHEDIR.TAG"), config)?;
-                    }
                 }
             }
         }