This reverts commit a50653295d.
The reasons cited were “debugging”, in which case
you can just add the attribute to `buildSkawarePackage`
and “customizing”, which is still possible with
a normal `overrideDerivation`.
The patch removed `outputs` for some reason
(possible oversight), so building nsss failed.
Plus lots of complexity (e.g. don’t forget to add new
arguments to `removeAttrs` otherwise there’s a bug now).
