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

[GHC]

#10485: Remove __MINGW32__ from all source files
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              Reporter:  thomie      |             Owner:
                  Type:  task        |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:  newcomer    |  Operating System:  Windows
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 See ticket:9945#comment:15.

 Prepare a patch that removes all occurrences of `__MINGW32__` from all
 source files, and send it to [wiki:Phabricator]. Easy!

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