[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 Austin Seipp <austin@…>):

 In [changeset:"34f7e9a3c99850859901ca74370f55f1d4e2279a/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="34f7e9a3c99850859901ca74370f55f1d4e2279a"
 Control CPP through settings file (#8683)

 Summary:
 Allow the CPP program and flag choices for GHC
 be configured via the the ghc settings file

 Test Plan: ran validate yesterday

 Reviewers: hvr, austin, mzero, simonmar

 Reviewed By: austin, mzero, simonmar

 Subscribers: mzero, simonmar, relrod, carter

 Differential Revision: https://phabricator.haskell.org/D26
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8683#comment:68>
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