[GHC] #14381: Consider making ghc-pkg fill in abi-depends based on depends

[GHC]

#14381: Consider making ghc-pkg fill in abi-depends based on depends
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        Reporter:  ezyang            |                Owner:  tdammers
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.2
       Component:  ghc-pkg           |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4159
       Wiki Page:                    |
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Comment (by bgamari):

 I have reverted the patch in comment:9 on `master` as the warning caused
 validation issues. That being said, we will ship it in 8.4.3 to allow
 distributions to drop their patches.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14381#comment:12>
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