fix feature warnings

mkmain.rs

@@ -1,10 +1,10 @@
-#![feature(core, env, io, os, path)]
+#![feature(core, env, io, path)]
 use std::env;
 use std::old_io::{File, Truncate, ReadWrite};
 use std::old_path::Path;
 
 static TEMPLATE: &'static str = "\
-#![feature(env, os)]
+#![feature(env)]
 extern crate \"@UTIL_CRATE@\" as uu@UTIL_CRATE@;
 
 use std::env;

mkuutils.rs

@@ -1,4 +1,4 @@
-#![feature(core, env, io, os, path)]
+#![feature(core, env, io, path)]
 
 use std::env;
 use std::old_io::{File, Truncate, Write};

src/mkfifo/mkfifo.rs

@@ -1,5 +1,5 @@
 #![crate_name = "mkfifo"]
-#![feature(collections, core, rustc_private, std_misc)]
+#![feature(collections, core, os, rustc_private, std_misc)]
 
 /*
  * This file is part of the uutils coreutils package.

src/nice/nice.rs

@@ -1,5 +1,5 @@
 #![crate_name = "nice"]
-#![feature(collections, core, os, rustc_private, std_misc)]
+#![feature(collections, core, io, os, rustc_private, std_misc)]
 
 /*
  * This file is part of the uutils coreutils package.

src/stdbuf/libstdbuf.rs

@@ -1,6 +1,6 @@
 #![crate_name = "libstdbuf"]
 #![crate_type = "staticlib"]
-#![feature(core, os)]
+#![feature(core, libc, os)]
 
 extern crate libc;
 use libc::{c_int, size_t, c_char, FILE, _IOFBF, _IONBF, _IOLBF, setvbuf};

src/tee/tee.rs

@@ -16,7 +16,6 @@ extern crate getopts;
 use std::old_io::{println, stdin, stdout, Append, File, Truncate, Write};
 use std::old_io::{IoResult};
 use std::old_io::util::{copy, NullWriter, MultiWriter};
-use std::os;
 use getopts::{getopts, optflag, usage};
 
 static NAME: &'static str = "tee";

src/uutils/uutils.rs

@@ -1,5 +1,5 @@
 #![crate_name = "uutils"]
-#![feature(core, env, os, path, rustc_private)]
+#![feature(core, env, path, rustc_private)]
 
 /*
  * This file is part of the uutils coreutils package.