Try to fix windows build.

src/tty/unix.rs

-extern crate nix;
-extern crate libc;
-
 use std;
 use std::io::Read;
+use libc;
+use nix;
 use nix::sys::termios;
+
 use char_iter;
 use consts::{self, KeyPress};
 use ::Result;

src/tty/windows.rs

-extern crate kernel32;
-extern crate winapi;
-
 use std::io;
 use std::marker::PhantomData;
+use kernel32;
+use winapi;
+
 use ::Result;
 
 pub type Handle = winapi::HANDLE;
@@ -21,6 +21,7 @@ fn get_std_handle(fd: winapi::DWORD) -> Result<winapi::HANDLE> {
     Ok(handle)
 }
 
+#[macro_export]
 macro_rules! check {
     ($funcall:expr) => {
         {