[GHC] #4879: Deprecate exports

[GHC]

#4879: Deprecate exports
-------------------------------------+-------------------------------------
        Reporter:  basvandijk        |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.0.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D638
-------------------------------------+-------------------------------------
Changes (by hvr):

 * differential:   => Phab:D638


Comment:

 forward-ported the patch to current HEAD and submitted to Phab:

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4879#comment:20>
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