... derives from com.sun.star.uno.RuntimeException instead of
com.sun.star.uno.Exception.

Only test that breaks with this change is jurt_uno/AnyConverter_Test,
which for mysterious reasons effectively tests that
IllegalArgumentException is a subclass of Exception and not
RuntimeException.  Presumably this is just a generic exception test that
happens to use IllegalArgumentException.

Some further testing indicates there are no problems expected at
runtime:
Running "make subsequentcheck" with all Java test code compiled against
a ridl.jar that does not contain the change, running against a soffice
that uses ridl.jar and rdbs with the change + ridl.jar with the change
on the test side yields exactly the same AnyConverter_Test failure, with
no other failures.

Change-Id: Iad183de76ec7e0d56648084e97cdcc160b5b033d