Remove List.rev

Co-authored-by: Kate <[email protected]>

src/state/opamSysInteract.ml

@@ -1110,7 +1110,7 @@ let install_packages_commands_t ?(env=OpamVariable.Map.empty) switch config sys_
         [], None
     | Some switch ->
     let dir = OpamPath.Switch.meta OpamStateConfig.(!r.root_dir) switch in
-    let packages_str = String.concat " " (List.rev (OpamSysPkg.Set.fold (fun p l -> OpamSysPkg.to_string p :: l) sys_packages [])) in
+    let packages_str = String.concat " " (OpamSysPkg.Set.fold (fun p l -> OpamSysPkg.to_string p :: l) sys_packages []) in
     let installedFile = create dir (basename (raw "nix_installed")) in
     write installedFile packages_str;
     let drvFile = create dir (basename (raw "env.nix")) in