MAINT-5011: Catch kdu_exception (aka int) in case it leaks out.

KDU internally throws kdu_exception, which is a typedef for int. It's possible
that such an exception might leak out.

Our usual strategy for unknown exceptions is to catch (...) and let
boost::current_exception_diagnostic_information() handle them. However, for
int (or a class not derived from std::exception), that function will only
shrug and report no information available.

Besides, we want to format kdu_exception specially anyway. First, the KDU
#defines are in hex, so we should report the value in hex. But on inspection,
certain of those hex values are actually multibyte ASCII literals in disguise
-- so also report the byte string value.

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