[v3] -fno-exception cleanups

[Benjamin Kosnik]

As has been noticed, some of the usage of the forwarding functions in
functexcept.h (ie __throw_*) has gotten a bit funky. 

This fixes up the situation. Some of the testsuite support library
exception classes have been removed, and replaced with the stdexception
classes that they were derived from. Well, all of them. This is easier
than going through hoops to support -fno-exceptions, and it turns out
that most of them were not really used anyway. 

tested x86/linux

-benjamin
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