survey: statify: Remove hardcoded link of zlib+ncurses

[nh2]

Building xmonad worked fine with it, let's see what CI thinks about it.

[nh2]

Looks like at least cabal is unhappy with it:

https://circleci.com/gh/nh2/static-haskell-nix/45

Linking dist/build/cabal/cabal ...
/nix/store/ljx5sayk6w0bpd1ahcf0rm5fj55cqafd-binutils-2.31.1/bin/ld: cannot find -lz

[nh2]

I should give another shot at removing zlib once I've merged 4f57531#diff-5a873d92c00133aa8d3f0a425a93aac2R453, which (by not splitting the .a file into its own output zlib.static, NixOS/nixpkgs#66490) should make the zlib.pc pkg-config file work as expected.

This might help in the task of not having to give -lz manually.

[nh2]

I found that I can't remove ncurses because ghc depends on it, but -lz in #44, see f9bdfa0.