winetest: Detect if an unhandled exception occurred in a child process and print an appropriate message.

[Robert Shearman]

Avoid getting caught incrementing the failure count in this case, as it 
could take a very long time to complete.
---
  include/wine/test.h |   16 ++++++++++++----
  1 files changed, 12 insertions(+), 4 deletions(-)
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