[smart_holder] Introducing PYBIND11_INTERNALS_SH_DEF.#3283

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rwgk:internals_sh_def

Sep 20, 2021

Commits on Sep 20, 2021

Introducing PYBIND11_INTERNALS_SH_DEF, replacing the approach of PR #2939. For compatibility with PR #3275.
rwgk
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