[GHC] #15982: Hadrian's `--configure` flag is broken on Windows

[GHC]

#15982: Hadrian's `--configure` flag is broken on Windows
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        Reporter:  snowleopard       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Build System      |              Version:  8.6.2
  (Hadrian)                          |
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Merged with 8d594beff68a6b12cdc8ccbd0cfc3e11cf184bfc.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15982#comment:5>
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