[GHC] #10485: Remove __MINGW32__ from all source files

[GHC]

#10485: Remove __MINGW32__ from all source files
-------------------------------------+-------------------------------------
        Reporter:  thomie            |                   Owner:  Berdes
            Type:  task              |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:  newcomer
Operating System:  Windows           |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D971
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"0db0ac4a255931036c5859c3f22108f4e27ccd11/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="0db0ac4a255931036c5859c3f22108f4e27ccd11"
 Removes all occurrences of __MINGW32__ (#10485)

 In Haskell files, replace `__MINGW32__` by `mingw32_HOST_OS`.

 In .c and .h files, delete `__MINGW32__` when `_WIN32` is also tested
 because `_WIN32` is always defined when `__MINGW32__` is. Also replace
 `__MINGW32__` by `_WIN32` when used standalone for consistency.

 Differential Revision: https://phabricator.haskell.org/D971
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10485#comment:6>
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