haiku: fix for redundant declare

Author: Al Hoang

test/test_stat.rs

@@ -37,7 +37,7 @@ use nix::sys::stat::lutimes;
 #[cfg(not(target_os = "redox"))]
 use nix::sys::stat::{FchmodatFlags};
 #[cfg(not(any(target_os = "redox", target_os = "haiku")))]
-use nix::sys::stat::{FchmodatFlags, UtimensatFlags};
+use nix::sys::stat::{UtimensatFlags};
 use nix::sys::stat::Mode;
 
 #[cfg(not(any(target_os = "netbsd", target_os = "redox")))]