TSRM: Replace `TSRM_TLS` by C11’s `thread_local` - #20062

TimWolla wants to merge 2 commits into

TSRM: Replace `TSRM_TLS` by C11’s `thread_local`#20062
TimWolla wants to merge 2 commits into
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TimWolla:thread-local-c11

TSRM: Replace `TSRM_TLS` by C11’s `thread_local`