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/iperf/2.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl }:
+{ lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   name = "iperf-2.0.13";
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
     ln -s $out/bin/iperf2 $out/bin/iperf
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://sourceforge.net/projects/iperf/";
     description = "Tool to measure IP bandwidth using UDP or TCP";
     platforms = platforms.unix;

pkgs/tools/networking/iperf/3.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, openssl, fetchpatch }:
+{ lib, stdenv, fetchurl, openssl, fetchpatch }:
 
 stdenv.mkDerivation rec {
   pname = "iperf";
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     ln -s $man/share/man/man1/iperf3.1 $man/share/man/man1/iperf.1
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "http://software.es.net/iperf/";
     description = "Tool to measure IP bandwidth using UDP or TCP";
     platforms = platforms.unix;