Fix warnings

src/tty/windows.rs

@@ -121,7 +121,8 @@ impl<R: Read> RawReader<R> {
 
     pub fn next_key(&mut self, _: bool) -> Result<KeyPress> {
         use std::char::decode_utf16;
-        use winapi::{LEFT_ALT_PRESSED, LEFT_CTRL_PRESSED, RIGHT_ALT_PRESSED, RIGHT_CTRL_PRESSED};
+        //use winapi::{LEFT_ALT_PRESSED, LEFT_CTRL_PRESSED, RIGHT_ALT_PRESSED, RIGHT_CTRL_PRESSED};
+        use winapi::{LEFT_ALT_PRESSED, RIGHT_ALT_PRESSED};
 
         let mut rec: winapi::INPUT_RECORD = unsafe { mem::zeroed() };
         let mut count = 0;