Update src/bootstrap/src/core/build_steps/test.rs

Co-authored-by: Onur Özkan <[email protected]>

Author: JoverZhang

src/bootstrap/src/core/build_steps/test.rs

@@ -1405,6 +1405,7 @@ pub struct RunMakeSupportTest {
 
 impl Step for RunMakeSupportTest {
     type Output = ();
+    const ONLY_HOSTS: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
         run.path("src/tools/run-make-support")