[CI/Build] make it possible to build with a free-threaded interpreter #112
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For Python 3.13/3.14, free-threaded Python does not support using the Limited C API and the Stable ABI. The purpose of this PR is to ensure that vLLM can be built from source under a free-threaded interpreter. It doesn't change anything for default (with-GIL) Python interpreters.
This is an identical change to that in vllm#29242, please see that PR for more context.