The provided BDF files are encoded as CP1252, but they claim to be
ISO8859-1. This causes a few glyphs (like `œ`) to be unused.
Use fontforge to re-encode from CP1252 to Unicode, but keep doing the
conversion with other tools because fontforge introduces spacing issues.
Since the Pango issue 457[1] has been fixed and Nixpkgs patched, it's no
longer necessary to keep X11 and .otb fonts in separate outputs (previously
they would cause application to display broken fonts).
[1]: https://gitlab.gnome.org/GNOME/pango/-/issues/457
* make font derivations fixed-output where applicable
* fix dead links
* `stdenv.lib` -> `lib` where `stdenv` is not involved
* remove `meta.platforms = [ unix ]` and `meta.platforms = [ linux ]` because the restriction has no sense for data packages