hack: add a linker_flavor feature gate

to make tidy accept `-Z linker-flavor` documentation

src/test/compile-fail/feature-gate-linker-flavor.rs

@@ -0,0 +1,13 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![linker_flavor] //~ ERROR the `#[linker_flavor]` attribute is
+
+fn main() {}