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/dd-agent/datadog-agent.nix

@@ -68,7 +68,7 @@ in buildGoPackage rec {
       --prefix LD_LIBRARY_PATH : ${lib.getLib systemd}/lib
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = ''
       Event collector for the DataDog analysis service
       -- v6 new golang implementation.

pkgs/tools/networking/dd-agent/datadog-process-agent.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, buildGoPackage  }:
+{ lib, stdenv, fetchFromGitHub, buildGoPackage  }:
 
 buildGoPackage rec {
   pname = "datadog-process-agent";
@@ -15,7 +15,7 @@ buildGoPackage rec {
   goDeps = ./datadog-process-agent-deps.nix;
   goPackagePath = "github.com/${owner}/${repo}";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Live process collector for the DataDog Agent v6";
     homepage    = "https://www.datadoghq.com";
     license     = licenses.bsd3;