Re-generate all Haskell packages with the latest version of cabal2nix.

This change brings support for building and running the regressions test suites.

pkgs/development/libraries/haskell/hashable/1.1.2.5.nix

@@ -1,10 +1,15 @@
-{ cabal, text }:
+{ cabal, QuickCheck, random, testFramework
+, testFrameworkQuickcheck2, text
+}:
 
 cabal.mkDerivation (self: {
   pname = "hashable";
   version = "1.1.2.5";
   sha256 = "0gbiaj5ck2bvvinndp2pg7qsm2h2izbnz9wi97dbm7i8r4qd9d9z";
   buildDepends = [ text ];
+  testDepends = [
+    QuickCheck random testFramework testFrameworkQuickcheck2 text
+  ];
   meta = {
     homepage = "http://github.com/tibbe/hashable";
     description = "A class for types that can be converted to a hash value";