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/servers/mail/opensmtpd/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, autoconf, automake, libtool, bison
+{ lib, stdenv, fetchurl, autoconf, automake, libtool, bison
 , libasr, libevent, zlib, libressl, db, pam, nixosTests
 }:
 
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     "localstatedir=\${TMPDIR}"
   ];
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://www.opensmtpd.org/";
     description = ''
       A free implementation of the server-side SMTP protocol as defined by

pkgs/servers/mail/opensmtpd/extras.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, openssl, libevent, libasr,
+{ lib, stdenv, fetchurl, openssl, libevent, libasr,
   python2, pkgconfig, lua5, perl, libmysqlclient, postgresql, sqlite, hiredis,
   enablePython ? true,
   enableLua ? true,
@@ -81,7 +81,7 @@ stdenv.mkDerivation rec {
     + stdenv.lib.optionalString enableMysql
       " -L${libmysqlclient}/lib/mysql";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://www.opensmtpd.org/";
     description = "Extra plugins for the OpenSMTPD mail server";
     license = licenses.isc;