Unrolled build for rust-lang#127195

Rollup merge of rust-lang#127195 - biabbas:vxworks_cleanup, r=jhpratt

Remove unqualified form import of io::Error in process_vxworks.rs and fallback on remove_dir_impl for vxworks

Hi all,
This is to address issue rust-lang#127084. On inspections it was found that io::Error refrences were all of qualified form and there was no need to add a unqualified form import. Also to successfully build rust for vxworks, we need to fallback on the remove_impl_dir implementations.

Thank you.

library/std/src/sys/pal/unix/fs.rs

@@ -1976,13 +1976,14 @@ pub fn chroot(dir: &Path) -> io::Result<()> {
 
 pub use remove_dir_impl::remove_dir_all;
 
-// Fallback for REDOX, ESP-ID, Horizon, Vita and Miri
+// Fallback for REDOX, ESP-ID, Horizon, Vita, Vxworks and Miri
 #[cfg(any(
     target_os = "redox",
     target_os = "espidf",
     target_os = "horizon",
     target_os = "vita",
     target_os = "nto",
+    target_os = "vxworks",
     miri
 ))]
 mod remove_dir_impl {
@@ -1996,6 +1997,7 @@ mod remove_dir_impl {
     target_os = "horizon",
     target_os = "vita",
     target_os = "nto",
+    target_os = "vxworks",
     miri
 )))]
 mod remove_dir_impl {

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

@@ -1,5 +1,5 @@
 use crate::fmt;
-use crate::io::{self, Error, ErrorKind};
+use crate::io::{self, ErrorKind};
 use crate::num::NonZero;
 use crate::sys;
 use crate::sys::cvt;