Add message when running clippy with --no-default-features for cg_gcc

src/bootstrap/src/core/build_steps/clippy.rs

@@ -394,6 +394,7 @@ fn run(self, builder: &Builder<'_>) -> Self::Output {
             &[],
         );
         self.build_compiler.configure_cargo(&mut cargo);
+        println!("Now running clippy on `rustc_codegen_gcc` with `--no-default-features`");
         cargo.arg("--no-default-features");
         run_cargo(builder, cargo, args, &stamp, vec![], true, false);
     }