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/ipaexfont/default.nix

@@ -1,9 +1,9 @@
-{ stdenv, fetchzip }:
+{ lib, fetchzip }:
 
-fetchzip rec {
+fetchzip {
   name = "ipaexfont-003.01";
 
-  url = "http://dl.ipafont.ipa.go.jp/IPAexfont/IPAexfont00301.zip";
+  url = "http://web.archive.org/web/20160616003021/http://dl.ipafont.ipa.go.jp/IPAexfont/IPAexfont00301.zip";
 
   postFetch = ''
     mkdir -p $out/share/fonts
@@ -12,7 +12,7 @@ fetchzip rec {
 
   sha256 = "02a6sj990cnig5lq0m54nmbmfkr3s57jpxl9fiyzrjmigvd1qmhj";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Japanese font package with Mincho and Gothic fonts";
     longDescription = ''
       IPAex font is a Japanese font developed by the Information-technology
@@ -24,6 +24,5 @@ fetchzip rec {
     homepage = http://ipafont.ipa.go.jp/;
     license = licenses.ipa;
     maintainers = with maintainers; [ gebner ];
-    platforms = with platforms; unix;
   };
 }