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

[Paolo Carlini]

Chris Fairles wrote:
> FAIL: ext/mt_allocator/deallocate_local_thread-5.cc execution test
> FAIL: ext/mt_allocator/deallocate_local_thread-7.cc execution test
>   
I don't think these are directly related to your work. These tests are
weak and fail for some targets already (I think there are issues with
the stack size).
> Besides those, feel free to comment/review. I'll post an updated patch
> once I figure out those segfaults.
>   
Ok...

Paolo.