Allow Clippy lints in compiler-builtins-smoke-test

Rather than always needing to exclude `cb` when running `cargo clippy`,
just disable Clippy for the included module.

library/compiler-builtins/libm/.github/workflows/main.yml

@@ -120,7 +120,6 @@ jobs:
       run: ./ci/download-musl.sh
     - run: |
         cargo clippy --all \
-          --exclude cb \
           --features libm-test/build-musl,libm-test/test-multiprecision \
           --all-targets
 

library/compiler-builtins/libm/crates/compiler-builtins-smoke-test/src/lib.rs

@@ -4,8 +4,9 @@
 
 #![feature(core_intrinsics)]
 #![allow(internal_features)]
-#![allow(dead_code)]
 #![no_std]
 
+#[allow(dead_code)]
+#[allow(clippy::all)] // We don't get `libm`'s list of `allow`s, so just ignore Clippy.
 #[path = "../../../src/math/mod.rs"]
 pub mod libm;