[issue46640] Python can now use the C99 NAN constant

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The Py_NAN has a special implementation for the ICC compiler, if __INTEL_COMPILER and ICC_NAN_STRICT macros are defined, in bpo-21167:
---
commit edbc28ce81f46d042f9d5ddf9c5bc8cecebc715a
Author: R David Murray <rdmurray at bitdance.com>
Date:   Thu Aug 13 09:58:07 2015 -0400

    #21167: Fix definition of NAN when ICC used without -fp-model strict.
    
    Patch from Chris Hogan of Intel, reviewed by Mark Dickinson.
---

I don't know if it should be kept if Py_NAN is modified to use the NAN constant. In case of doubt, I prefer to remove the ICC code since we have no ICC buildbot anymore and maybe ICC changed in the meanwhile.

Also, I don't have acess to ICC.

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nosy: +mark.dickinson, r.david.murray

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