ctr-libc: remove conditional dependency on std

I'd thought that it would be necessary for implementing features such as the std::os::raw types in ctr-std, but I do not believe that that is the case.

ctr-libc/src/lib.rs

@@ -10,20 +10,7 @@
 
 #![allow(bad_style, overflowing_literals, improper_ctypes, non_camel_case_types)]
 
-// Attributes needed when building as part of the standard library
-#![cfg_attr(stdbuild, feature(no_std, core, core_slice_ext, staged_api, custom_attribute, cfg_target_vendor))]
-#![cfg_attr(stdbuild, feature(link_cfg))]
-#![cfg_attr(stdbuild, no_std)]
-#![cfg_attr(stdbuild, staged_api)]
-#![cfg_attr(stdbuild, allow(warnings))]
-#![cfg_attr(stdbuild, unstable(feature = "libc",
-                               reason = "use `libc` from crates.io",
-                               issue = "27783"))]
-
-#![cfg_attr(not(feature = "use_std"), no_std)]
-
-#[cfg(all(not(stdbuild), not(dox), feature = "use_std"))]
-extern crate std as core;
+#![no_std]
 
 mod constants;
 mod functions;

ctr-std/Cargo.toml

@@ -8,7 +8,6 @@ git = "https://github.com/rust-lang-nursery/compiler-builtins"
 
 [dependencies.ctr-libc]
 path = "../ctr-libc"
-default-features = false
 
 [dependencies.alloc_system]
 version = "0.1.1"

ctr-std/Xargo.toml

@@ -2,5 +2,4 @@
 
 [dependencies.ctr-libc]
 path = "../ctr-libc"
-default-features = false
 stage = 1

ctru-rs/Xargo.toml

@@ -2,7 +2,6 @@
 
 [dependencies.ctr-libc]
 path = "../ctr-libc"
-default-features = false
 stage = 1
 
 [dependencies.std]

ctru-sys/Cargo.toml

@@ -5,4 +5,4 @@ authors = ["Ronald Kinard <furyhunter600@gmail.com>"]
 license = "https://en.wikipedia.org/wiki/Zlib_License"
 
 [dependencies]
-ctr-libc = { path = "../ctr-libc", default-features = false }
+ctr-libc = { path = "../ctr-libc" }