[GHC] #10449: Out-of-tree tests broken on MinGW + native Python due to quoting of config.compiler

[GHC]

#10449: Out-of-tree tests broken on MinGW + native Python due to quoting of
config.compiler
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        Reporter:  Rufflewind  |                   Owner:
            Type:  bug         |                  Status:  new
        Priority:  normal      |               Milestone:
       Component:  Test Suite  |                 Version:  7.10.1
      Resolution:              |                Keywords:
Operating System:  Windows     |            Architecture:  Unknown/Multiple
 Type of failure:  Other       |               Test Case:
      Blocked By:              |                Blocking:
 Related Tickets:  #10441      |  Differential Revisions:
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Comment (by thomie):

 Ok, now I understand, sorry for taking so long. The MINGW magic should
 happen *before* the string reaches Python, as you said. And now it
 doesn't, because the string is too heavily quoted.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10449#comment:7>
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