tests: slightly cleanup `tests/ui/command/command-pre-exec.rs`

- Remove already stabilized feature gate and
  `#![allow(stable_features)]`.
- Convert `ignore-windows` to `only-unix`.
- Convert `ignore-*` to `needs-subprocess`.

1 files changed, 4 insertions, 6 deletions

diff --git a/tests/ui/command/command-pre-exec.rs b/tests/ui/command/command-pre-exec.rs
index 7242dea2775..7299f357bd0 100644
--- a/tests/ui/command/command-pre-exec.rs
+++ b/tests/ui/command/command-pre-exec.rs
@@ -1,11 +1,9 @@
 //@ run-pass
-
-#![allow(stable_features)]
-//@ ignore-windows - this is a unix-specific test
-//@ ignore-wasm32 no processes
-//@ ignore-sgx no processes
+//@ only-unix (this is a unix-specific test)
+//@ needs-subprocess
 //@ ignore-fuchsia no execvp syscall
-#![feature(process_exec, rustc_private)]
+
+#![feature(rustc_private)]
 
 extern crate libc;