data/fonts: cleanup

* 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

pkgs/data/fonts/libre-franklin/default.nix

@@ -1,19 +1,21 @@
-{ stdenv, fetchzip }:
+{ lib, fetchFromGitHub }:
 
-fetchzip rec {
+fetchFromGitHub rec {
   name = "libre-franklin-1.014";
 
-  url = https://github.com/impallari/Libre-Franklin/archive/006293f34c47bd752fdcf91807510bc3f91a0bd3.zip;
+  owner = "impallari";
+  repo = "Libre-Franklin";
+  rev = "006293f34c47bd752fdcf91807510bc3f91a0bd3";
 
   postFetch = ''
-    mkdir -p $out/share/{doc,fonts}
-    unzip -j $downloadedFile \*.otf                    -d $out/share/fonts/opentype
-    unzip -j $downloadedFile \*README.md \*FONTLOG.txt -d "$out/share/doc/${name}"
+    tar xf $downloadedFile --strip=1
+    install -m444 -Dt $out/share/fonts/opentype */OTF/*.otf
+    install -m444 -Dt $out/share/doc/${name}    README.md FONTLOG.txt
   '';
 
-  sha256 = "1rkjp8x62cn4alw3lp7m45q34bih81j2hg15kg5c1nciyqq1qz0z";
+  sha256 = "0aq280m01pbirkzga432340aknf2m5ggalw0yddf40sqz7falykf";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "A reinterpretation and expansion based on the 1912 Morris Fuller Benton’s classic.";
     homepage = https://github.com/impallari/Libre-Franklin;
     license = licenses.ofl;