[GHC] #10726: Upgrade MingW-w64 distributions for windows

[GHC]

#10726: Upgrade MingW-w64 distributions for windows
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        Reporter:  Phyx-             |                Owner:
            Type:  task              |               Status:  patch
        Priority:  high              |            Milestone:  8.0.1
       Component:  Build System      |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9218 #9014       |  Differential Rev(s):  Phab:D1123
  #10435                             |
       Wiki Page:                    |
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Comment (by Phyx-):

 Sorry, haven't had much time lately to look at GHC the past weeks. I
 should have free time again next week and I'll try to get as much as my
 tickets done!. I think I have a proper solution for this for `8.0.1` that
 doesn't require me to change the code for all platforms.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10726#comment:60>
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