treewide: clean up 'meta = with' pattern

This commit was created by a combination of scripts and tools:
- an ast-grep script to prefix things in meta with `lib.`,
- a modified nixf-diagnose / nixf combination to remove unused `with
lib;`, and
- regular nixfmt.

Co-authored-by: Wolfgang Walther <walther@technowledgy.de>

pkgs/development/python2-modules/pygtk/default.nix

@@ -89,11 +89,11 @@ buildPythonPackage rec {
                   $out/${python.sitePackages}/${pname}-${version}.pth
   '';
 
-  meta = with lib; {
+  meta = {
     description = "GTK 2 Python bindings";
     homepage = "https://gitlab.gnome.org/Archive/pygtk";
-    platforms = platforms.all;
-    license = with licenses; [ lgpl21Plus ];
+    platforms = lib.platforms.all;
+    license = with lib.licenses; [ lgpl21Plus ];
     maintainers = with lib.maintainers; [ bryango ];
   };
 }