pkgs/tools: stdenv.lib -> lib

pkgs/tools/text/gawk/gawkextlib.nix

@@ -4,7 +4,7 @@
 , expat, tre, makeWrapper }:
 
 let
-  buildExtension = stdenv.lib.makeOverridable
+  buildExtension = lib.makeOverridable
     ({ name, gawkextlib, extraBuildInputs ? [ ], doCheck ? true }:
       let is_extension = !isNull gawkextlib;
       in stdenv.mkDerivation rec {
@@ -32,7 +32,7 @@ let
         ];
 
         buildInputs = [ gawk ] ++ extraBuildInputs;
-        propagatedBuildInputs = stdenv.lib.optional is_extension gawkextlib;
+        propagatedBuildInputs = lib.optional is_extension gawkextlib;
 
         setupHook = if is_extension then ./setup-hook.sh else null;
         inherit gawk;