Whitelist new dependencies

Author: oli-obk

src/tools/tidy/src/deps.rs

@@ -87,6 +87,7 @@ const WHITELIST: &[Crate] = &[
     Crate("fuchsia-zircon"),
     Crate("fuchsia-zircon-sys"),
     Crate("getopts"),
+    Crate("gcc"),
     Crate("humantime"),
     Crate("jobserver"),
     Crate("kernel32-sys"),
@@ -122,6 +123,7 @@ const WHITELIST: &[Crate] = &[
     Crate("scopeguard"),
     Crate("smallvec"),
     Crate("stable_deref_trait"),
+    Crate("stacker"),
     Crate("tempfile"),
     Crate("termcolor"),
     Crate("terminon"),