Message 412620 - Python tracker

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Content 
The macro Py_NAN may or may not be defined: in particular, a platform that doesn't have NaNs is supposed to be able to define Py_NO_NAN in pyport.h to indicate that.

But not all of our uses of `Py_NAN` are guarded by suitable #ifdef conditionals. As a result, compilation fails if Py_NAN is not defined.