[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
-------------------------------+-------------------------------------------
        Reporter:  Rufflewind  |                   Owner:
            Type:  bug         |                  Status:  merge
        Priority:  normal      |               Milestone:  7.10.2
       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:  Phab:D911
-------------------------------+-------------------------------------------
Changes (by thomie):

 * status:  patch => merge
 * milestone:  7.12.1 => 7.10.2


Comment:

 Please merge the commit above to ghc-7.10. It depends on
 6694ccf9444baf565eb0f38f7808767616f23825, so that one will have to go in
 as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10449#comment:12>
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