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-bodoni/default.nix

@@ -1,19 +1,21 @@
-{ stdenv, fetchzip }:
+{ lib, fetchFromGitHub }:
 
-fetchzip rec {
+fetchFromGitHub rec {
   name = "libre-bodoni-2.000";
 
-  url = https://github.com/impallari/Libre-Bodoni/archive/995a40e8d6b95411d660cbc5bb3f726ffd080c7d.zip;
+  owner = "impallari";
+  repo = "Libre-Bodoni";
+  rev = "995a40e8d6b95411d660cbc5bb3f726ffd080c7d";
 
   postFetch = ''
-    mkdir -p $out/share/{doc,fonts}
-    unzip -j $downloadedFile \*/v2000\ -\ initial\ glyphs\ migration/OTF/\*.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 */v2000\ -\ initial\ glyphs\ migration/OTF/*.otf
+    install -m444 -Dt $out/share/doc/${name}    README.md FONTLOG.txt
   '';
 
-  sha256 = "0pnb1xydpvcl9mkz095f566kz7yj061wbf40rwrbwmk706f6bsiw";
+  sha256 = "0my0i5a7f0d27m6dcdirjmlcnswqqfp8gl3ccxa5f2wkn3qlzkvz";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Bodoni fonts adapted for today's web requirements";
     longDescription = ''
       The Libre Bodoni fonts are based on the 19th century Morris Fuller