[issue42747] Remove Py_TPFLAGS_HAVE_VERSION_TAG flag?

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

>I don't see the purpose of the Py_TPFLAGS_HAVE_VERSION_TAG flag.

IMO, There have no more exact description of `Py_TPFLAGS_HAVE_VERSION_TAG`in docs, so I perfer to remove it.

> By the way, is it worth it to remove Py_TPFLAGS_HAVE_FINALIZE? Or is it going to break too many extension modules?

I am not found who use Py_TPFLAGS_HAVE_AM_SEND or Py_TPFLAGS_HAVE_FINALIZE in github.I perfer to keep it as soon as posssible if there have users using them.
MAYBE we should do some surveys firstly?

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nosy: +shihai1991

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