[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:  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:
-------------------------------+-------------------------------------------
Changes (by thomie):

 * related:   => #10441


Comment:

 I guess this works as well?
 {{{
 python run-tests.py -e "config.compiler='/c/programs/ghc/ghc'"
 }}}

 Can we try to not rely on this magic? See also #10441.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10449#comment:1>
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