equilux-theme: drop gnome-themes-extra dependency, modernize derivation (#452188)

pkgs/by-name/eq/equilux-theme/package.nix

@@ -3,7 +3,6 @@
   stdenv,
   fetchFromGitHub,
   gnome-shell,
-  gnome-themes-extra,
   glib,
   libxml2,
   gtk-engine-murrine,
@@ -12,15 +11,15 @@
   bc,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "equilux-theme";
   version = "20181029";
 
   src = fetchFromGitHub {
     owner = "ddnexus";
     repo = "equilux-theme";
-    rev = "equilux-v${version}";
-    sha256 = "0lv2yyxhnmnkwxp576wnb01id4fp734b5z5n0l67sg5z7vc2h8fc";
+    tag = "equilux-v${finalAttrs.version}";
+    hash = "sha256-zCEo2D6/PH0MBbb8ssg415EWA1iWm1Nu59NWC7v3YlM=";
   };
 
   nativeBuildInputs = [
@@ -30,7 +29,6 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    gnome-themes-extra
     gdk-pixbuf
     librsvg
   ];
@@ -49,11 +47,11 @@ stdenv.mkDerivation rec {
     rm $out/share/themes/*/COPYING
   '';
 
-  meta = with lib; {
-    inherit (src.meta) homepage;
+  meta = {
+    inherit (finalAttrs.src.meta) homepage;
     description = "Material Design theme for GNOME/GTK based desktop environments";
-    license = licenses.gpl2;
-    platforms = platforms.all;
-    maintainers = [ maintainers.fpletz ];
+    license = lib.licenses.gpl2;
+    platforms = lib.platforms.all;
+    maintainers = [ lib.maintainers.fpletz ];
   };
-}
+})