[GHC] #15726: Don't include Haskeline (and others) in the global package DB

[GHC]

#15726: Don't include Haskeline (and others) in the global package DB
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           Reporter:  judah          |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.6.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 GHC installations include `haskeline` in their global DB, as well as its
 dependencies (currently: `stm` and `terminfo`).  However, Haskeline isn't
 a dependency of the `ghc` library, so that shouldn't be necessary.

 Originally suggested by hvr here, in response to needing to pull `stm`
 into the global DB:
 https://github.com/judah/haskeline/pull/61#issuecomment-294878302

 This change would let Haskeline add dependencies more easily.  See in
 particular the pending PR to depend on the "exceptions" package:
 https://github.com/judah/haskeline/pull/97

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15726>
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