* gdouros-fonts: fix build
some hashes were changed since ods files are now installed
* camingo-code: fix build
contents not changed
* hannom: fix build
* helvetica-neue-lt-std: fix build
perms changed so the hash changed too
* liberastika: fix build
hash changed due to no doc dir anymore
* kochi-substitute-naga10: fix build
* xkcd-font: use a simpler method to remove unneeded files
* fonts: also remove hidden files
* 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
Some of these fonts are still available but their url has moved and
their hash has been changed. If anyone still uses them, feel free to add
them back.
