mate: remove major-ver and minor-ver

Keep only the version atribute in derivations, with the full version
string of the package. This will make it easier to write a script for
automatic updating of the packages using the update-source-version
command from common-updater-scripts.

pkgs/desktops/mate/mate-themes/default.nix

@@ -3,20 +3,11 @@
 
 stdenv.mkDerivation rec {
   name = "mate-themes-${version}";
-  version = "${major-ver}.${minor-ver}";
-  # There is no 3.24 release.
-  major-ver = if stdenv.lib.versionOlder gnome3.version "3.23" then gnome3.version else "3.22";
-  minor-ver = {
-    "3.20" = "23";
-    "3.22" = "14";
-  }."${major-ver}";
+  version = "3.22.14";
 
   src = fetchurl {
-    url = "http://pub.mate-desktop.org/releases/themes/${major-ver}/${name}.tar.xz";
-    sha256 = {
-      "3.20" = "0xmcm1kmkhbakhwy5vvx3gll5v2gvihwnbf0gyjf75fys6h3818g";
-      "3.22" = "09fqvlnmrvc73arl7jv9ygkxi46lw7c1q8qra6w3ap7x83f9zdak";
-    }."${major-ver}";
+    url = "http://pub.mate-desktop.org/releases/themes/${mate.getRelease version}/${name}.tar.xz";
+    sha256 = "09fqvlnmrvc73arl7jv9ygkxi46lw7c1q8qra6w3ap7x83f9zdak";
   };
 
   nativeBuildInputs = [ pkgconfig intltool ];