Revert "haskell-unlambda: update to version 0.1.3"

This reverts commit b4a3a61285a3b5e75368b7e6dbf44a9c92943d5b.

The unlambda package failed to build after this change, reverting.

pkgs/development/libraries/haskell/unlambda/default.nix

@@ -7,6 +7,7 @@ cabal.mkDerivation (self: {
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ mtl ];
+  hyperlinkSource = false;
   meta = {
     description = "Unlambda interpreter";
     license = "GPL";