remove .last-warned-change-id on x clean

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/clean.rs

@@ -140,6 +140,7 @@ fn clean_default(build: &Build) {
     rm_rf(&build.out.join("tmp"));
     rm_rf(&build.out.join("dist"));
     rm_rf(&build.out.join("bootstrap"));
+    rm_rf(&build.out.join("bootstrap").join(".last-warned-change-id"));
     rm_rf(&build.out.join("rustfmt.stamp"));
 
     for host in &build.hosts {