PackageDescription.buildDepends should be nuked

[ezyang]

It is a vestige of backwards-compatibility and all build-depends should be put in components.

[dylex]

Just for clarification, in the current documentation there is discussion about removing the customFieldsPD field that points to this issue, but mainly seems to be discussing the buildDepends field. Is this comment just misplaced, or will this change affect customFieldsPD as well?

[ezyang]

That's a doc bug, the Haddock comment is being associated with the wrong field.