servo: Merge #5033 - Fix gonk warnings, add to tidy (from Manishearth:gonk-warn); r=Ms2ger

Rust still reports that the `*mut ANativeWindow` argument in `gnw_perform` in `gonk/src/window.rs` is ffi unsafe,
however `ANativeWindow` is marked as `#[repr(C)]` and should be okay.

Source-Repo: https://github.com/servo/servo
Source-Revision: 8bc4d07e50aa38371ef383b8f22ec9f7cacaae96

servo/python/tidy.py

@@ -13,7 +13,7 @@ import os
 import fnmatch
 from licenseck import licenses
 
-directories_to_check = ["src", "components"]
+directories_to_check = ["ports/gonk", "components"]
 filetypes_to_check = [".rs", ".rc", ".cpp", ".c", ".h", ".py"]
 
 ignored_files = [
@@ -25,6 +25,8 @@ ignored_files = [
     "components/script/dom/bindings/codegen/*",
     "components/style/properties/mod.rs",
     "components/servo/target/*",
+    "ports/gonk/target/*",
+    "ports/gonk/src/native_window_glue.cpp",
 
     # MIT license
     "components/util/deque/mod.rs",