[bug#35930] haskell Setup.hs-related changes

[Robert Vollmert]

> On 13. Jun 2019, at 17:57, Timothy Sample <address@hidden> wrote:
>>  https://issues.guix.gnu.org/issue/35930
> 
> The first patch breaks “ghc-easyplot”.
> 
> I’m currently building some packages to test the other patches, and if
> everything builds fine, they LGTM with some minor tweaks (which I’ve
> already made).  Should I push it to master or staging?  It means
> rebuilding all of our Haskell packages, which is a few hundered
> packages.
> 
> Robert, do you know why the first patch doesn’t work?  Should I just
> omit it?

Yes go head, I thought it worked at some point but am very doubtful
right now. I’ll look into it again, but it’s not a necessary part here
I think.