tests: fix more, stty and nohup compilation on redox

tests/by-util/test_more.rs

@@ -3,6 +3,8 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
+#![cfg(all(unix, not(target_os = "redox")))]
+
 #[cfg(unix)]
 use std::fs::File;
 #[cfg(unix)]

tests/by-util/test_nohup.rs

@@ -9,7 +9,7 @@
 use std::thread::sleep;
 use uutests::new_ucmd;
 #[cfg(unix)]
-use uutests::{at_and_ucmd, util::TestScenario, util_name};
+use uutests::{util::TestScenario, util_name};
 
 // General observation: nohup.out will not be created in tests run by cargo test
 // because stdin/stdout is not attached to a TTY.
@@ -38,6 +38,8 @@ fn test_nohup_exit_codes() {
     target_os = "openbsd"
 ))]
 fn test_nohup_multiple_args_and_flags() {
+    use uutests::at_and_ucmd;
+
     let (at, mut ucmd) = at_and_ucmd!();
 
     ucmd.args(&["touch", "-t", "1006161200", "file1", "file2"])

tests/by-util/test_stty.rs

@@ -5,7 +5,7 @@
 
 // spell-checker:ignore parenb parmrk ixany iuclc onlcr ofdel icanon noflsh econl igpar ispeed ospeed NCCS nonhex gstty notachar cbreak evenp oddp CSIZE
 
-#![cfg(unix)]
+#![cfg(all(unix, not(target_os = "redox")))]
 
 use uutests::util::{expected_result, pty_path};
 use uutests::{at_and_ts, new_ucmd, unwrap_or_return};