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/networking/libreswan/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, makeWrapper,
+{ lib, stdenv, fetchurl, makeWrapper,
   pkgconfig, systemd, gmp, unbound, bison, flex, pam, libevent, libcap_ng, curl, nspr,
   bash, iproute, iptables, procps, coreutils, gnused, gawk, nss, which, python,
   docs ? false, xmlto, libselinux, ldns
@@ -83,7 +83,7 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://libreswan.org";
     description = "A free software implementation of the VPN protocol based on IPSec and the Internet Key Exchange";
     platforms = platforms.linux ++ platforms.freebsd;