Fix bootstrap build_all test

Author: GuillaumeGomez

src/bootstrap/src/core/builder/tests.rs

@@ -645,9 +645,8 @@ mod dist {
             &[TEST_TRIPLE_1, TEST_TRIPLE_2, TEST_TRIPLE_3],
         ));
         let mut builder = Builder::new(&build);
-        builder.run_step_descriptions(
             &Builder::get_step_descriptions(Kind::Build),
-            &["compiler/rustc".into(), "library".into()],
+            &["compiler/rustc".into(), "std".into()],
         );
 
         assert_eq!(