haskell-timezone-series: fix build with GHC 8.0.1

- Fix the incorrect sha256 hash of the patch.
- Apply the patch only when compiling with GHC 8.0.x.

pkgs/development/haskell-modules/configuration-common.nix

···
     '';
   }));
 
-  timezone-series = appendPatch super.timezone-series (pkgs.fetchpatch {
-    url = "https://github.com/ryantrinkle/timezone-series/commit/f8dece8c016db6476e2bb0d4f972769a76f6ff40.patch";
-    sha256 = "02sgciica2pzaal7wwp36v6iybr1hjypda0zljxylnq0qs8bizhy";
-  });
 }

pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix

···
       sha256 = "1i45196qrzlhgbisnvkzni4n54saky0i1kyla162xcb5cg3kf2ji";
     };
   });
+
+  # https://github.com/ygale/timezone-series/issues/2
+  timezone-series = appendPatch super.timezone-series (pkgs.fetchpatch {
+    url = "https://github.com/ryantrinkle/timezone-series/commit/f8dece8c016db6476e2bb0d4f972769a76f6ff40.patch";
+    sha256 = "01wxhknsnn7lyl9v8viz7m5zhmyi3bqpbva7d3dx1dxn0nmkfh6a";
+  });
+
 }