Adrien Destugues 56abf4aa37 Fix std::isnan and friends for gcc2.
gcc2 was relying on the c99 functions being there, but they are not in
the std namespace.
* Disable the C99 functions and macros in C++ mode
* Redefine them as inline functions in cmath in the std namespace.

Fixes #7396.
2014-11-27 10:58:49 +01:00
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