[Nix-dev] Reducing the number of Haskell builds in the NixOS/Nixpkgs channel

[Peter Simons]

Hi Eelco,

 > I would suggest removing most of the GHC versions from the channels
 > (i.e. remove "recurseIntoAttrs"), except the default (7.4.2) and the
 > latest (7.6.2).

yes, I think that is a good idea. If it turns out that we desperately
need binaries for any of the older versions again, then we can always
re-enable that particular hierarchy.

Take care,
Peter