Ignore PAL lint for std::panicking

Author: Mark-Simulacrum

src/tools/tidy/src/pal.rs

@@ -59,6 +59,8 @@ const EXCEPTION_PATHS: &[&str] = &[
     "src/libstd/sys_common/mod.rs",
     "src/libstd/sys_common/net.rs",
     "src/libstd/sys_common/backtrace.rs",
+    // panic_unwind shims
+    "src/libstd/panicking.rs",
     "src/libterm", // Not sure how to make this crate portable, but test crate needs it.
     "src/libtest", // Probably should defer to unstable `std::sys` APIs.
     "src/libstd/sync/mpsc", // some tests are only run on non-emscripten