patch applied (testsuite): ignore " .exe" in program output, for Windows

[Simon Marlow]

Thu Mar 16 07:54:40 PST 2006  Simon Marlow <simonmar at microsoft.com>
  * ignore ".exe" in program output, for Windows

    M ./driver/testlib.py -2 +8
    R ./tests/ghc-regress/concurrent/should_run/conc021.stderr-mingw