Drop compat code for outdated MSVC. #12867
Merged
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Per
https://wiki.python.org/moin/WindowsCompilers#Which_Microsoft_Visual_C.2B-.2B-_compiler_to_use_with_a_specific_Python_version_.3F
https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B
Py>=3.5+ requires VC++>=14, which corresponds to _MSV_VER>=1900, so drop
the now irrelevant #ifdef blocks.
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