[GHC] #9604: Python test runner assumes native Python on Windows

[GHC]

#9604: Python test runner assumes native Python on Windows
-------------------------------------+-------------------------------------
       Reporter:  gintas             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Build System       |                 Version:  7.8.2
       Keywords:                     |        Operating System:  Windows
   Architecture:  Unknown/Multiple   |         Type of failure:  Building
     Difficulty:  Unknown            |  GHC failed
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 runtests.py assumes that ctypes.windll is always available when running on
 Windows, but that is in fact only available when using a native Windows
 Python, but not the mingw/msys Python. The code causes a crash over a
 trivial issue of setting the terminal to UTF-8 mode.

 See attached patch for a fix. (The second patch is a cleanup.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9604>
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