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/development/ocaml-modules/estring/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildOcaml, ocaml, fetchurl }:
+{ lib, stdenv, buildOcaml, ocaml, fetchurl }:
 
 if stdenv.lib.versionAtLeast ocaml.version "4.06"
 then throw "estring is not available for OCaml ${ocaml.version}"
@@ -13,7 +13,7 @@ buildOcaml rec {
     sha256 = "0b6znz5igm8pp28w4b7sgy82rpd9m5aw6ss933rfbw1mrh05gvcg";
   };
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "http://estring.forge.ocamlcore.org/";
     description = "Extension for string literals";
     license = licenses.bsd3;