[GHC] #9746: tests/ghci/scripts/T8172 is sensitive to drive name on Windows

[GHC]

#9746: tests/ghci/scripts/T8172 is sensitive to drive name on Windows
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              Reporter:  gintas      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Test Suite  |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:  Windows     |     Architecture:  Unknown/Multiple
       Type of failure:              |       Difficulty:  Unknown
  None/Unknown                       |       Blocked By:
             Test Case:              |  Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 So, can we just fix the test, so that it is not sensitive in this way?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9746#comment:2>
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