oleaut32: Add an exception handler around code executed on the server side from the typelib marshaler.

[Robert Shearman]

This fixes bug #3321 and a relay log with native DLLs confirms that DCOM 
handles the exception.
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  dlls/oleaut32/tmarshal.c |   37 +++++++++++++++++++++++++++++++------
  1 files changed, 31 insertions(+), 6 deletions(-)
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