Remove ./y.rs prepare call until vendoring is implemented

Author: bjorn3

src/bootstrap/test.rs

@@ -3038,10 +3038,12 @@ impl Step for CodegenCranelift {
         // FIXME handle vendoring for source tarballs before removing the --skip-test below
         let download_dir = builder.out.join("cg_clif_download");
 
+        /*
         let mut prepare_cargo = build_cargo();
         prepare_cargo.arg("--").arg("prepare").arg("--download-dir").arg(&download_dir);
         #[allow(deprecated)]
         builder.config.try_run(&mut prepare_cargo.into()).unwrap();
+        */
 
         let mut cargo = build_cargo();
         cargo