Move std::os::raw to core::os::raw

… and re-export at the old location.

This is primarily motivated by rust-lang/libc#71
(to support src/liblibc), but also because why not.

Author: SimonSapin

src/libcore/lib.rs

@@ -170,3 +170,10 @@ pub mod fmt;
 
 // note: does not need to be public
 mod tuple;
+
+/* Raw OS-specific types for the current platform/architecture */
+
+pub mod os {
+    #![allow(missing_docs, bad_style)]
+    pub mod raw;
+}

src/libstd/os/raw.rs renamed to src/libcore/os/raw.rs

@@ -31,4 +31,5 @@ pub use sys::ext as windows;
 #[cfg(target_os = "netbsd")]   pub mod netbsd;
 #[cfg(target_os = "openbsd")]   pub mod openbsd;
 
-pub mod raw;
+#[stable(feature = "raw_os", since = "1.1.0")]
+pub use core::os::raw;