Remove workaround for rust-lang/rust#25544.

Author: whitequark

src/arch/mod.rs

@@ -2,17 +2,10 @@
 // Copyright (c) edef <edef@edef.eu>,
 //               whitequark <whitequark@whitequark.org>
 // See the LICENSE file included in this distribution.
-pub use self::imp::*;
-
-// rust-lang/rust#25544
-// #[cfg_attr(target_arch = "x86",    path = "x86.rs")]
-// #[cfg_attr(target_arch = "x86_64", path = "x86_64.rs")]
-// mod imp;
 
-#[cfg(target_arch = "x86")]
-#[path = "x86.rs"]
-mod imp;
+pub use self::imp::*;
 
-#[cfg(target_arch = "x86_64")]
-#[path = "x86_64.rs"]
+#[allow(unused_attributes)] // rust-lang/rust#35584
+#[cfg_attr(target_arch = "x86",    path = "x86.rs")]
+#[cfg_attr(target_arch = "x86_64", path = "x86_64.rs")]
 mod imp;