Apply suggestions from code review

Author: CDirkx

library/std/src/sys/unix/process/process_common.rs

@@ -223,7 +223,7 @@ impl Command {
     pub fn get_groups(&self) -> Option<&[gid_t]> {
         self.groups.as_deref()
     }
-    #[allow(dead_code)]
+
     pub fn get_closures(&mut self) -> &mut Vec<Box<dyn FnMut() -> io::Result<()> + Send + Sync>> {
         &mut self.closures
     }

library/std/src/sys/unix/process/process_vxworks.rs

@@ -18,7 +18,6 @@ impl Command {
         needs_stdin: bool,
     ) -> io::Result<(Process, StdioPipes)> {
         use crate::sys::cvt_r;
-        // const CLOEXEC_MSG_FOOTER: &'static [u8] = b"NOEX";
         let envp = self.capture_env();
 
         if self.saw_nul() {
@@ -61,6 +60,9 @@ impl Command {
                 t!(cvt(libc::chdir(cwd.as_ptr())));
             }
 
+            // pre_exec closures are ignored on VxWorks
+            let _ = self.get_closures();
+
             let c_envp = envp
                 .as_ref()
                 .map(|c| c.as_ptr())