Pull request 2617 (don't require global package database)

[Michael Snoyman]

A few months ago I noticed that pull request 2617[1] implements a change
I'd love to see in Cabal: not requiring a global package database for GHCs
that support this (7.6 and on). The change is small and self-contained, and
looks like a good one to me, but it hasn't been merged. Any chance someone
with a commit bit could review?

[1] https://github.com/haskell/cabal/pull/2617
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