Refactored the modules for bare metals systems to

suit the advices provided in rust-lang#375.

Author: gbip

src/lib.rs

@@ -314,9 +314,9 @@ cfg_if! {
     } else if #[cfg(unix)] {
         mod unix;
         pub use unix::*;
-    } else if #[cfg(target_arch = "arm", target_os = "none")] {
-        pub mod arm;
-        pub use arm::*;
+    } else if #[cfg(target_os = "none")] {
+        pub mod none;
+        pub use none::*;
     } else {
         // Unknown target_family
     }

src/arm/mod.rs renamed to src/none/arm.rs

@@ -0,0 +1,3 @@
+#[cfg(target_arch="arm")]
+pub mod arm;
+pub use arm::*;