[v3] suppress special math when c++0x, v2

[Benjamin Kosnik]

This is much like what was posted yesterday, but instead of adding a new 
macro (_GLIBCXX_SUPPRESS_TR1) I just use the usual pre-defined macro for 
C++0x support.

I do this because it's simpler, and also because defining/undefining is 
pretty fragile, especially in something that includes other std headers 
and has a non-trivial dependency chain.

tested x86/linux

-benjamin
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