remove command_access

Author: chansuke

src/env_var.rs

@@ -86,7 +86,7 @@ mod tests {
     use crate::test::{with_saved_path, Env};
 
     use std::collections::HashMap;
-    use std::ffi::OsString;
+    use std::ffi::{OsStr, OsString};
 
     #[test]
     fn deduplicate_and_concat_paths() {

src/lib.rs

@@ -1,4 +1,3 @@
-#![feature(command_access)]
 #![deny(rust_2018_idioms)]
 #![allow(
     clippy::too_many_arguments,