This reverts commit f61176c5396ed513f3d399f73f38ab78a066667f, reversing
changes made to a27ca029ee2b39e04d7d2a516a7228f4b62067fb.
Conflicts:
pkgs/development/libraries/ncurses/default.nix
Editing Docbook is no fun, IMHO, so I'd rather store the Haskell
documentation in Markdown format and use Pandoc to convert that into
Docbook as part of the build process.