[v3] system_error

[Benjamin Kosnik]

This adds in support for the <system_error> include, which was first
posted here:

http://gcc.gnu.org/ml/libstdc++/2007-05/msg00082.html

The formal specification is still pretty up in the air, but this
seems to be a decent starting point. Post-toronto, all messaging bits
were removed: there have been some suggestions on how to do this (best
from Peter Dimov, IMHO) but nothing concrete. This part can be added at
a later date, when the dust settles.

tested x86/linux
tested x86/linux x arm-elf

-benjamin
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