[issue44340] Add support for building cpython with clang thin lto

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

Now CPython 3.11 supports the Thin LTO,
Thank you for the report and contribution, Brett!

And also thank you Pablo and Gregory for the reviews!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44340>
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