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/development/python-modules/pyfftw/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi
+{ lib, stdenv, buildPythonPackage, fetchPypi
 , fftw, fftwFloat, fftwLongDouble, numpy, scipy, cython, dask }:
 
 buildPythonPackage rec {
@@ -25,7 +25,7 @@ buildPythonPackage rec {
   #  export DYLD_LIBRARY_PATH="${pkgs.fftw.out}/lib"
   #'';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "A pythonic wrapper around FFTW, the FFT library, presenting a unified interface for all the supported transforms";
     homepage = "http://hgomersall.github.com/pyFFTW/";
     license = with licenses; [ bsd2 bsd3 ];