[GHC] #13792: Allow building using distro GCC on Windows

[GHC]

#13792: Allow building using distro GCC on Windows
-------------------------------------+-------------------------------------
        Reporter:  Phyx-             |                Owner:  Phyx-
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Build System      |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3637
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by Phyx-):

 * status:  new => patch
 * differential:   => Phab:D3637


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13792#comment:2>
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