claws-mail: add the litehtml_viewer plugin #86030
Motivation for this change
The Claws Mail fancy (webkit) plugin has been deprecated for security reasons, but there's a new litehtml-based HTML viewer plugin to take its place (as of Claws 3.17.4). This PR adds support for that plugin. All that's needed is the addition of the gumbo HTML parser (dependency of litehtml). The Claws release tarball includes a copy of litehtml, for better or for worse; litehtml isn't in Nixpkgs yet but maybe we should package it ourselves and de-embed Claws's copy.
I've tested this out myself and it renders HTML emails fine for me.
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