Rust updates

build.rs

@@ -1,11 +1,11 @@
-#![feature(io, path, os)]
+#![feature(old_io, old_path)]
 use std::old_io::Command;
 use std::old_io::fs::PathExtensions;
 use std::old_io::fs;
-use std::os;
+use std::env;
 
 fn main() {
-  let out_dir = os::getenv("OUT_DIR").unwrap();
+  let out_dir = env::var("OUT_DIR").unwrap();
   let mut objects = Vec::new();
 
   let files = fs::readdir(&Path::new("src")).unwrap();

src/lib.rs

@@ -1,6 +1,6 @@
 #![feature(no_std)]
 #![feature(asm, core)]
-#![feature(os, libc)]
+#![feature(os, libc, page_size)]
 #![no_std]
 
 #[macro_use]

src/platform.rs

@@ -1,7 +1,8 @@
 extern crate libc;
 extern crate std;
 use self::std::prelude::v1::*;
-use self::std::os::{errno, page_size, MemoryMap};
+use self::std::os::{errno, MemoryMap};
+use self::std::env::page_size;
 use self::std::os::MapOption::{MapReadable, MapWritable, MapNonStandardFlags};
 use stack;