Merge "Add TIDY_EXTERNAL_VENDOR"

	if tidy.Properties.Tidy != nil && !*tidy.Properties.Tidy {

		return flags

	}

	// Some projects like external/* and vendor/* have clang-tidy disabled by default.

	// They can enable clang-tidy explicitly with the "tidy:true" property.

	if config.NoClangTidyForDir(ctx.ModuleDir()) && !proptools.Bool(tidy.Properties.Tidy) {

	// Some projects like external/* and vendor/* have clang-tidy disabled by default,

	// unless they are enabled explicitly with the "tidy:true" property or

	// when TIDY_EXTERNAL_VENDOR is set to true.

	if !ctx.Config().IsEnvTrue("TIDY_EXTERNAL_VENDOR") &&

		!proptools.Bool(tidy.Properties.Tidy) &&

		config.NoClangTidyForDir(ctx.ModuleDir()) {

		return flags

	}

	// If not explicitly disabled, set flags.Tidy to generate .tidy rules.