[GHC] #8393: hsc2hs copies #define/#undef directives to generated .hs file when cross-compiling

[GHC]

#8393: hsc2hs copies #define/#undef directives to generated .hs file when cross-
compiling
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       Reporter:  rwbarton          |             Owner:  rwbarton
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  hsc2hs            |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 See summary. This causes a cross-compilation of ghc to fail while building
 GHC/Stack.hsc from libraries/base, because base.cabal no longer specifies
 `extensions: CPP` as of dfb52c3d5.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8393>
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