[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:
            Type:  feature request   |           Status:  patch
        Priority:  high              |        Milestone:  7.8.2
       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:                    |  Related Tickets:  #8439
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Comment (by carter):

 figured out what i was missing (thanks @archblob on irc for helping!),
 theres another configure.ac, distrib/configure.ac.in thats used for
 configure at install time!

 http://github.com/cartazio/ghc/tree/cpp_silly-contrib-configure-in is the
 current patch set with that fix, will clean it up a bit, and it probably
 needs some refactoring and such.

 seems to validate (running test suite now, but no longer failing on the
 test install xhmtl stuff, will do a full clean validate tomorrow evening)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:57>
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