Enable `wxWebView` in `wxGTK32`.

Closes #267712

Needed as a dependency for a number of language-specific packages,
including https://hexdocs.pm/desktop in Elixir.

nixos/doc/manual/release-notes/rl-2311.section.md

···
 
 - TeX Live environments can now be built with the new `texlive.withPackages`. The procedure for creating custom TeX packages has been changed, see the [Nixpkgs manual](https://nixos.org/manual/nixpkgs/stable/#sec-language-texlive-custom-packages) for more details.
 
+- In `wxGTK32`, the webkit module `wxWebView` has been enabled on all builds; prior releases only enabled this on Darwin.
+
 ## Nixpkgs internals {#sec-release-23.11-nixpkgs-internals}
 
 - Node.js v14, v16 has been removed as they were end of life. Any dependent packages that contributors were not able to reasonably upgrade were dropped after a month of notice to their maintainers, were **removed**.

pkgs/development/libraries/wxwidgets/wxGTK32.nix

···
 , compat30 ? true
 , unicode ? true
 , withMesa ? !stdenv.isDarwin
-, withWebKit ? stdenv.isDarwin
+, withWebKit ? true
 , webkitgtk
 , setfile
 , AGL