Squashing a few warnings.

components/servo/lib.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(core, env, libc, path, rustc_private, std_misc, thread_local)]
+#![feature(libc, path, rustc_private, thread_local)]
 
 #[macro_use]
 extern crate log;

components/servo/main.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![feature(env, os, start)]
+#![feature(start)]
 
 #[cfg(target_os="android")]
 extern crate libc;

components/util/lib.rs

@@ -12,14 +12,11 @@
 #![feature(io)]
 #![feature(optin_builtin_traits)]
 #![feature(old_io)]
-#![feature(old_path)]
-#![feature(page_size)]
 #![feature(path)]
 #![feature(path_ext)]
 #![feature(plugin)]
 #![feature(rustc_private)]
 #![feature(std_misc)]
-#![feature(str_words)]
 #![feature(unicode)]
 #![feature(unsafe_destructor)]