Delete old-{time,locale} and haskell{98,2010}

Summary:
Depends on D510. This is the final blow and removes them from
the tree completely.

Signed-off-by: Austin Seipp <austin@well-typed.com>

Test Plan: I looked really hard but didn't see them.

Reviewers: hvr, ekmett

Subscribers: thomie, carter

Differential Revision: https://phabricator.haskell.org/D511

GHC Trac Issues: #9590