fix imports for haiku and redox

Author: inglorion

test/sys/test_uio.rs

@@ -1,16 +1,18 @@
+#[cfg(not(target_os = "redox"))]
 use crate::require_largefile;
 use nix::sys::uio::*;
 use nix::unistd::*;
 use rand::distributions::Alphanumeric;
 use rand::{thread_rng, Rng};
 use std::fs::OpenOptions;
-use std::io::{IoSlice, Read, Seek, SeekFrom, Write};
+use std::io::{IoSlice, Write};
+#[cfg(not(target_os = "redox"))]
 use std::os::unix::fs::FileExt;
 use std::os::unix::io::{FromRawFd, OwnedFd};
 use std::{cmp, iter};
 
 #[cfg(not(target_os = "redox"))]
-use std::io::IoSliceMut;
+use std::io::{IoSliceMut, Read, Seek, SeekFrom};
 
 use tempfile::tempdir;
 #[cfg(not(target_os = "redox"))]

test/test_fcntl.rs

@@ -1,3 +1,4 @@
+#[cfg(not(target_os = "redox"))]
 use crate::require_largefile;
 #[cfg(not(target_os = "redox"))]
 use nix::errno::*;
@@ -30,6 +31,7 @@ use std::os::unix::fs;
 use tempfile::{self, tempdir, NamedTempFile};
 
 #[test]
+#[cfg(not(target_os = "redox"))]
 fn test_open_largefile() {
     // Checks that files opened with open can grow beyond 32-bit file size.
     // On some platforms, this requires opening the file with an alternative

test/test_unistd.rs

@@ -1,3 +1,4 @@
+use cfg_if::cfg_if;
 use libc::{_exit, mode_t};
 use nix::errno::Errno;
 #[cfg(not(any(target_os = "redox", target_os = "haiku")))]