[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:  7.10.3
       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 lukexi):

 I've uploaded a build with the patch here (along with bumping Cabal to
 1.22.5):
 https://github.com/lukexi/ghc/releases/download/ghc-7.10.3-rc2-plus-
 export-symbols/ghc-7.10.2.20151117-x86_64-unknown-mingw32.tar.bz2

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10726#comment:49>
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