RFC - patch to support multhreaded C++ exceptions for single CPU systems

[Øyvind Harboe]

These are the changes I did (slightly modified) to add support
for multithreaded exceptions on single CPU systems. I needed
this for some testing during development, and it has served me well.

If the design is sound, it only needs is a bit of CDL configuration
support before it can be proposed as a patch to eCos.

Basically what it does is to extend the suppport for single threaded
C++ exceptions to single CPU multithreaded.

- It has a neglible performance impact

- gccpatch.txt contains a slight modification to the GCC runtime
support for single threaded exceptions to allow eCos to extend
it to the single CPU multithreaded case.

Øyvind
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