[GHC] #8683: add "cpp program" and "cpp program options" to settings file

[GHC]

#8683: add "cpp program" and "cpp program options" to settings file
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        Reporter:  carter            |            Owner:  carter
            Type:  feature request   |           Status:  patch
        Priority:  high              |        Milestone:  7.8.3
       Component:  Compiler          |          Version:  7.8.1-rc2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:  9094              |  Related Tickets:  #8439
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Comment (by carter):

 point being, similar issues arise on supported platforms even if you fix
 to using only clang or gcc. my pesonal GHC setup actually uses the hybrid
 of clang + gcc (which IS NOT the default for this patch, merely in my
 personal config after i built my ghc)

 eg, you can't built hfsevents on mac unless you use Clang as the CC for
 ghc.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:64>
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