Don't mark ineffective_unstable_trait_impl as an internal lint

It's not an internal lint:
- It's not in the rustc::internal lint group
- It's on unconditionally, because it actually lints `staged_api`, not
  the compiler

This fixes a bug where `#[deny(rustc::internal)]` would warn that
`rustc::internal` was an unknown lint.

Author: jyn514

alloc/src/task.rs

@@ -33,7 +33,8 @@ pub trait Wake {
     }
 }
 
-#[allow(rustc::ineffective_unstable_trait_impl)]
+#[cfg_attr(bootstrap, allow(rustc::ineffective_unstable_trait_impl))]
+#[cfg_attr(not(bootstrap), allow(ineffective_unstable_trait_impl))]
 #[unstable(feature = "wake_trait", issue = "69912")]
 impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for Waker {
     fn from(waker: Arc<W>) -> Waker {
@@ -43,7 +44,8 @@ impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for Waker {
     }
 }
 
-#[allow(rustc::ineffective_unstable_trait_impl)]
+#[cfg_attr(bootstrap, allow(rustc::ineffective_unstable_trait_impl))]
+#[cfg_attr(not(bootstrap), allow(ineffective_unstable_trait_impl))]
 #[unstable(feature = "wake_trait", issue = "69912")]
 impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for RawWaker {
     fn from(waker: Arc<W>) -> RawWaker {