treewide: with stdenv.lib; in meta -> with lib;

Part of: https://github.com/NixOS/nixpkgs/issues/108938

meta = with stdenv.lib;

is a widely used pattern. We want to slowly remove
the `stdenv.lib` indirection and encourage people
to use `lib` directly. Thus let’s start with the meta
field.

This used a rewriting script to mostly automatically
replace all occurances of this pattern, and add the
`lib` argument to the package header if it doesn’t
exist yet.

The script in its current form is available at
https://cs.tvl.fyi/depot@2f807d7f141068d2d60676a89213eaa5353ca6e0/-/blob/users/Profpatsch/nixpkgs-rewriter/default.nix

pkgs/tools/text/icdiff/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, pythonPackages }:
+{ lib, stdenv, fetchFromGitHub, pythonPackages }:
 
 pythonPackages.buildPythonApplication rec {
   pname = "icdiff";
@@ -11,7 +11,7 @@ pythonPackages.buildPythonApplication rec {
     sha256 = "080v8h09pv8qwplin4kwfm0kmqjwdqjfxbpcdrv16sv4hwfwl5qd";
   };
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://www.jefftk.com/icdiff";
     description = "Side-by-side highlighted command line diffs";
     maintainers = with maintainers; [ aneeshusa ];