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/cairosvg/1_x.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchFromGitHub, cairocffi, nose, fontconfig
+{ lib, stdenv, buildPythonPackage, fetchFromGitHub, cairocffi, nose, fontconfig
 , cssselect2, defusedxml, pillow, tinycss2 }:
 
 # CairoSVG 2.x dropped support for Python 2 so offer CairoSVG 1.x as an
@@ -28,7 +28,7 @@ buildPythonPackage rec {
   #   FONTCONFIG_FILE=${fontconfig.out}/etc/fonts/fonts.conf nosetests .
   # '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://cairosvg.org";
     license = licenses.lgpl3;
     description = "SVG converter based on Cairo";

pkgs/development/python-modules/cairosvg/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi, isPy3k, fetchpatch
+{ lib, stdenv, buildPythonPackage, fetchPypi, isPy3k, fetchpatch
 , cairocffi, cssselect2, defusedxml, pillow, tinycss2
 , pytest, pytestrunner, pytestcov, pytest-flake8, pytest-isort }:
 
@@ -17,7 +17,7 @@ buildPythonPackage rec {
 
   checkInputs = [ pytest pytestrunner pytestcov pytest-flake8 pytest-isort ];
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     homepage = "https://cairosvg.org";
     license = licenses.lgpl3;
     description = "SVG converter based on Cairo";