[issue46212] Avoid temporary `varargs` tuple creation in argument passing

[colorfulappl]

colorfulappl <colorfulappl at qq.com> added the comment:

I am a rookie in Python, did not notice changing PyAPI_FUNC means breaking backward compatibility.

I have reverted _PyArg_UnpackKeywordsWithVararg and committed again.

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<https://bugs.python.org/issue46212>
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