More import fixes for Windows.

src/uucore/Cargo.toml

@@ -6,6 +6,7 @@ authors = []
 [dependencies]
 libc = "*"
 time = "*"
+winapi = "*"
 
 [lib]
 path = "lib.rs"

src/uucore/fs.rs

@@ -12,7 +12,8 @@
 // be backported to stable (<= 1.1). This will likely be dropped
 // when the path trait stabilizes.
 
-use ::libc;
+#[cfg(unix)]
+use super::libc;
 use std::env;
 use std::fs;
 use std::io::{Error, ErrorKind, Result};

src/uucore/lib.rs

@@ -1,5 +1,6 @@
 extern crate libc;
 extern crate time;
+#[cfg(windows)] extern crate winapi;
 
 #[macro_use]
 mod macros;