Fix hastache build error.

`hastache` has no binary output but for `mkReadme`, so disable the
separate bin output and keep removing the `mkReadme`.

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

@@ -862,6 +862,7 @@ self: super: {
   # Don't install internal mkReadme tool.
   hastache = overrideCabal super.hastache (drv: {
     doCheck = false;
+    enableSeparateBinOutput = false;
     postInstall = "rm $out/bin/mkReadme && rmdir $out/bin";
   });