[issue32592] Drop support of Windows Vista and 7 in Python 3.9

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

Here are a couple more:

* WSA_FLAG_NO_HANDLE_INHERIT is supported. Code related to `support_wsa_no_inherit` in Modules/socketmodule.c can be removed.

* AddDllDirectory and RemoveDllDirectory are supported. os__add_dll_directory_impl and os__remove_dll_directory_impl in Modules/posixmodule.c no longer need to manually link to them via GetModuleHandleW and GetProcAddress.

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