[GHC] #9218: Upgrade the version of MinGW shipped with GHC

[GHC]

#9218: Upgrade the version of MinGW shipped with GHC
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        Reporter:  komadori          |                   Owner:  gintas
            Type:  task              |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.8.2
      Resolution:                    |                Keywords:
Operating System:  Windows           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:  9014              |                Blocking:  9215
 Related Tickets:  #3390 #10705      |  Differential Revisions:  Phab:D339
  #10726                             |
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Comment (by thomie):

 awson: do you have any idea what that test failure in `ghci/prog003` is
 about?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9218#comment:26>
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