[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 Phyx-):

 @RyanGIScott

 The first one is indeed because you can't like against `libmingwex`

 {{{
 $ dlltool.exe --output-def libmingwex.def --export-all-symbols
 libmingwex.a
 $ grep "log1p" libmingwex.def
         log1p @ 494
         log1pf @ 495
         log1pl @ 496
 }}}

 So re-exporting `log1p` should fix it. But this feels like a moving
 target.
 Try adding `SymI_HasProto(log1p)` to the list. If you're on `HEAD`, these
 symbols have been moved to `RtsSymbols.c`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10726#comment:53>
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