400+ libstdc++ testsuite failures due to missing definition of M_PI

[Paolo Carlini]

David Billinghurst wrote:
> This is not unreasonable, as the C++0X standard (from ISO/IEC JTC 1/SC
> 22 N 4411 2008-10-09) doesn't mention M_PI (in <cmath> or elsewhere).
You are right, M_PI is an extension. I committed the below for now, at
least.

Paolo.

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