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

[GHC]

#10726: Upgrade MingW-w64 distributions for windows
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        Reporter:  Phyx-             |                Owner:  Phyx-
            Type:  task              |               Status:  merge
        Priority:  normal            |            Milestone:  7.10.3
       Component:  Build System      |              Version:  7.11
      Resolution:  fixed             |             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                             |
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Comment (by Phyx-):

 If this is merged back, it's important to merge
 e415369e91347d23f149a1a750b267da2ee5d74c as well, as that switches the URL
 to a Haskell.org location from the msys2.org site in this patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10726#comment:24>
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