[GHC] #14756: `ghc -M` doesn't emit dependencies for header files included either via CPP or CApiFFI

[GHC]

#14756: `ghc -M` doesn't emit dependencies for header files included either via CPP
or CApiFFI
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  capi capiffi
                                     |  cpp
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14757            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by hvr):

 * related:   => #14757


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14756#comment:2>
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