message: Make sure ApiLevelChecker is ready for AndroidX migration
  Summary: Accept the old or the new version of the support library. Here are the docs for androidx's RequiresApi:
diff: @@ -25,6 +25,9 @@ void LevelChecker::init(int32_t min_level, const Scope& scope) {
  s_min_level = min_level;
  s_requires_api =
  DexType::get_type("Landroid/support/annotation/RequiresApi;");
  + if (s_requires_api == nullptr) {
  + s_requires_api = DexType::get_type("Landroidx/annotation/RequiresApi;");
  + }
  s_target_api = DexType::get_type("Landroid/annotation/TargetApi;");
  if (s_requires_api == nullptr) {
  fprintf(stderr,
  