[GHC] #10239: Fragile CPP test for big endian in T7600

[GHC]

#10239: Fragile CPP test for big endian in T7600
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        Reporter:  trommler          |                   Owner:  trommler
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Test Suite        |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:  T7600
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by trommler):

 This is fixed in HEAD.

 The fix is to include `ghcconfig.h`, which defines the appropriate macro.
 I'll submit my patch anyway and we can discuss it in Phabricator.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10239#comment:2>
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