std: Move platform specific memchr code into sys

src/libstd/sys/windows/memchr.rs

@@ -0,0 +1,15 @@
+// Copyright 2015 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.
+//
+// Original implementation taken from rust-memchr
+// Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
+
+// Fallback memchr is fastest on windows
+pub use sys_common::memchr::fallback::{memchr, memrchr};

src/libstd/sys/windows/mod.rs

@@ -26,6 +26,7 @@ pub mod env;
 pub mod ext;
 pub mod fs;
 pub mod handle;
+pub mod memchr;
 pub mod mutex;
 pub mod net;
 pub mod os;