Test T12504 on Windows

[Simon Peyton Jones]

Test hsc2hs/T12504 is failing thus on Windows. Something path-y.
Simon



-{-# LINE 1 "T12504/path/to/T12504.hsc" #-}

-{-# LINE 2 "T12504/path/to/T12504.hsc" #-}

+{-# LINE 1 "T12504\\path\\to\\T12504.hsc" #-}

+{-# LINE 2 "T12504\\path\\to\\T12504.hsc" #-}

*** unexpected failure for T12504(normal)
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