Prefetch data so that the package doesn't try to connect to the internet.

…specify the data files

This is more understandable and safer than using a nested list.

…of copying

This prevents duplication in the nix store.

…w-mnist-input-data

This reverts commit 93ed13f.

libtensorflow is only used by the Haskell tensorflow packages and they
don't work with tensorflow-1.10 yet. So the easiest solution is to
just revert this commit and add it back when they do gain support.

This reverts commit 7139911.

libtensorflow is only used by the Haskell tensorflow packages and they
don't work with tensorflow-1.10 yet. So the easiest solution is to
just revert this commit and add it back when they do gain support.

…successfully

haskellPackages.tensorflow-mnist-input-data: fetch