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/applications/networking/flent/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonApplication, fetchPypi, matplotlib, procps, pyqt5, python
+{ lib, stdenv, buildPythonApplication, fetchPypi, matplotlib, procps, pyqt5, python
 , pythonPackages, qt5, sphinx, xvfb_run }:
 
 buildPythonApplication rec {
@@ -29,7 +29,7 @@ buildPythonApplication rec {
     makeWrapperArgs+=("''${qtWrapperArgs[@]}")
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "The FLExible Network Tester";
     homepage = "https://flent.org";
     license = licenses.gpl3;

pkgs/applications/networking/flent/http-getter.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, curl, pkg-config }:
+{ lib, stdenv, fetchFromGitHub, cmake, curl, pkg-config }:
 
 stdenv.mkDerivation {
   pname = "http-getter";
@@ -14,7 +14,7 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake pkg-config ];
   buildInputs = [ curl ];
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://github.com/tohojo/http-getter";
     description = "Simple getter for HTTP URLs using cURL";
     platforms = platforms.unix;