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/graphics/ploticus/default.nix

@@ -1,4 +1,4 @@
-{stdenv, fetchurl, zlib, libX11, libpng}:
+{lib, stdenv, fetchurl, zlib, libX11, libpng}:
 
 stdenv.mkDerivation {
   name = "ploticus-2.42";
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
     ln -sf pl.1 "$out"/man/man1/ploticus.1
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "A non-interactive software package for producing plots and charts";
     longDescription = ''Ploticus is a free, GPL'd, non-interactive
       software package for producing plots, charts, and graphics from