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/os-specific/linux/rtkit/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, fetchpatch
+{ lib, stdenv, fetchFromGitHub, fetchpatch
 , meson, ninja, pkgconfig, unixtools
 , dbus, libcap, polkit, systemd
 }:
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
     "-Dsystemd_systemunitdir=${placeholder "out"}/etc/systemd/system"
   ];
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://github.com/heftig/rtkit";
     description = "A daemon that hands out real-time priority to processes";
     license = with licenses; [ gpl3 bsd0 ]; # lib is bsd license