[v3] c++0x <system_error> CD updates

[Chris Fairles]

Just to follow up on the seg fault. It happens because default
constructed error_code's, &system_category returns 0. So any
e.category().name() will seg fault since &e.category() == 0. Kind of
at a loss as to why. In a contained test case I can't reproduce it
(attached the appropriate files).

I have a feeling I'm missing something obvious here...

Chris
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