Exclude clippy lints from tidy license check

Author: Mark-Simulacrum

src/tools/tidy/src/deps.rs

@@ -41,6 +41,7 @@ static EXCEPTIONS: &'static [&'static str] = &[
     "fuchsia-zircon", // BSD-3-Clause, rustdoc, rustc, cargo (jobserver & tempdir)
     "cssparser-macros", // MPL-2.0, rustdoc
     "selectors", // MPL-2.0, rustdoc
+    "clippy_lints", // MPL-2.0 rls
 ];
 
 pub fn check(path: &Path, bad: &mut bool) {