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/culmus/default.nix

@@ -1,16 +1,12 @@
-{ stdenv, fetchzip }:
+{ lib, fetchzip }:
 
 let
   version = "0.133";
-in stdenv.mkDerivation {
+in fetchzip {
   name = "culmus-${version}";
-
-  src = fetchzip {
-    url = "mirror://sourceforge/culmus/culmus/${version}/culmus-${version}.tar.gz";
-    sha256 = "0q80j3vixn364sc23hcy6098rkgy0kb4p91lky6224am1dwn2qmr";
-  };
-
-  installPhase = ''
+  url = "mirror://sourceforge/culmus/culmus/${version}/culmus-${version}.tar.gz";
+  postFetch = ''
+    tar xf $downloadedFile --strip=1
     mkdir -p $out/share/fonts/{truetype,type1}
     cp -v *.pfa $out/share/fonts/type1/
     cp -v *.afm $out/share/fonts/type1/
@@ -19,12 +15,13 @@ in stdenv.mkDerivation {
     cp -v *.otf $out/share/fonts/truetype/
     cp -v fonts.scale-ttf $out/share/fonts/truetype/fonts.scale
   '';
+  sha256 = "0zqqjcrqmbd4389hqz2dwymkkcxjrq9ylyriiv3gbmzl6l1ffk3g";
 
   meta = {
     description = "Culmus Hebrew fonts";
     longDescription = "The Culmus project aims at providing the Hebrew-speaking GNU/Linux and Unix community with a basic collection of Hebrew fonts for X Windows.";
-    platforms = stdenv.lib.platforms.all;
-    license = stdenv.lib.licenses.gpl2;
+    platforms = lib.platforms.all;
+    license = lib.licenses.gpl2;
     homepage = http://culmus.sourceforge.net/;
     downloadPage = http://culmus.sourceforge.net/download.html;
   };