[PATCH] Fix some ghci way testsuite failures on Windows

[Bill Tutt]

On my 32bit Windows make fulltest run I got these two failures:

   ../../libraries/directory/tests  getDirContents002 [bad stdout or
stderr] (ghci)
   ../../libraries/process/tests   process004 [bad stdout or stderr] (ghci)

The problem here is that although the respective all.T files have
normalise_exe,
However, check_stderr_ok only normalizes away '.exe' when platform override
files DO NOT exist and these test cases have platform overrides for mingw32.

This seems like something to add a helper function for in testlib.py.

Here's the patches for one way to accomplish fixing the problem.

Fyi,
Bill
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