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

[Chris Fairles]

Attached is a draft patch of the CD changes to <system_error> (from
n2798). Its not ready for mainline as there are still a few
regressions due to segfaulting category().name().

FAIL: 27_io/basic_ostream/inserters_other/char/error_code.cc execution test
FAIL: 27_io/basic_ostream/inserters_other/wchar_t/error_code.cc execution test
FAIL: ext/mt_allocator/deallocate_local_thread-5.cc execution test
FAIL: ext/mt_allocator/deallocate_local_thread-7.cc execution test

Besides those, feel free to comment/review. I'll post an updated patch
once I figure out those segfaults.

Cheers,
Chris
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