[issue23325] Turn SIG_DFL and SIG_IGN into functions

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

My PR 31759 removes the assumption of small int singletons and replaces C comparison with PyObject_RichCompareBool() Py_EQ calls.

I still prefer Serhiy's solution, but it may cause backwards incompatible breakage. My fix can be backported to 3.9 and 3.10 without breakage. It resolves my failing tests on Emscripten, too.

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