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/misc/snapper/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub
+{ lib, stdenv, fetchFromGitHub
 , autoreconfHook, pkgconfig, docbook_xsl, libxslt, docbook_xml_dtd_45
 , acl, attr, boost, btrfs-progs, dbus, diffutils, e2fsprogs, libxml2
 , lvm2, pam, python, util-linux, fetchpatch, json_c, nixosTests
@@ -66,7 +66,7 @@ stdenv.mkDerivation rec {
     done
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Tool for Linux filesystem snapshot management";
     homepage = "http://snapper.io";
     license = licenses.gpl2;