patch applied (testsuite): don't try to run hp2ps if the program failed with exit(>127)

[Simon Marlow]

Mon Sep  3 06:55:13 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * don't try to run hp2ps if the program failed with exit(>127)

    M ./driver/testlib.py -1 +2