Rewrite ‘with pkgs.lib’ -> ‘with lib’

Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.

nixos/modules/profiles/installation-device.nix

@@ -1,7 +1,7 @@
 # Provide a basic configuration for installation devices like CDs.
-{ config, pkgs, modules, ... }:
+{ config, lib, ... }:
 
-with pkgs.lib;
+with lib;
 
 {
   imports =
@@ -45,7 +45,7 @@ with pkgs.lib;
 
     # Enable wpa_supplicant, but don't start it by default.
     networking.wireless.enable = true;
-    jobs.wpa_supplicant.startOn = pkgs.lib.mkOverride 50 "";
+    jobs.wpa_supplicant.startOn = mkOverride 50 "";
 
     # Tell the Nix evaluator to garbage collect more aggressively.
     # This is desirable in memory-constrained environments that don't