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/text/unoconv/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, python3, libreoffice-unwrapped, asciidoc, makeWrapper
+{ lib, stdenv, fetchFromGitHub, python3, libreoffice-unwrapped, asciidoc, makeWrapper
 # whether to install odt2pdf/odt2doc/... symlinks to unoconv
 , installSymlinks ? true
 }:
@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
     make install-links prefix="$out"
   '' else "");
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Convert between any document format supported by LibreOffice/OpenOffice";
     homepage = "http://dag.wieers.com/home-made/unoconv/";
     license = licenses.gpl2;