[GHC] #10511: Simplify some preprocessor expressions

[GHC]

#10511: Simplify some preprocessor expressions
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        Reporter:  Berdes            |                   Owner:  Berdes
            Type:  task              |                  Status:  patch
        Priority:  low               |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  D981
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"ce53138ff0d156e9f229d0adab745d2d4cfaf582/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ce53138ff0d156e9f229d0adab745d2d4cfaf582"
 Delete _MSC_VER when not necessary, fix #10511

 Simplify some preprocessor expressions involving `_MSC_VER` because
 `_WIN32` is always defined when `_MSC_VER` is.

 Differential Revision: https://phabricator.haskell.org/D981
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10511#comment:2>
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