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

[GHC]

#9218: Upgrade the version of MinGW shipped with GHC
-------------------------------------+-------------------------------------
        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
-------------------------------------+-------------------------------------
Changes (by Phyx-):

 * related:  #3390 => #3390 #10705


Comment:

 I've started splitting this up to get it in:

 >> •downloads mingw during ./configure step, instead of via explicit git
 clone ...ghc-tarballs.git.
 > This is now done in #10705

 [[BR]]

 >> •change the provider of the ​32bit and ​64bit packages from rubenvb to
 mingw-builds. By default this results in much ​larger downloads (2x for
 64bit, 5x for 32bit), which means #9014 should be fixed first.
 > Any particular reason why this was done? Was there anything missing from
 the rubenvb builds?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9218#comment:23>
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