Backport pybnd11 gil_safe_call_once_and_store fix for possible deadlo… #719

Job	Run time
Documentation	9m 26s
Python 3.6 • ubuntu-20.04	6m 44s
Python 3.7 • ubuntu-20.04	6m 48s
Python 3.8 (with Praat tests) • ubuntu-20.04	21m 25s
Python 3.9 • ubuntu-20.04	6m 53s
Python 3.10 • ubuntu-20.04	6m 37s
Python 3.11 • ubuntu-20.04	6m 43s
Python 3.12 (with Praat tests) • ubuntu-20.04	21m 34s
Python pypy-2.7 • ubuntu-20.04	8m 2s
Python pypy-3.7 • ubuntu-20.04	6m 56s
Python pypy-3.8 • ubuntu-20.04	7m 1s
Python pypy-3.9 (with Praat tests) • ubuntu-20.04	21m 43s
Python 3.8 (GCC 10) • ubuntu-20.04	6m 0s
Python 3.8 (Clang 12) • ubuntu-20.04	6m 8s
Python 3.8 (Release) • ubuntu-20.04	8m 18s
Python 3.8 (with Praat tests) • macos-12	20m 37s
Python 3.9 • macos-12	6m 20s
Python 3.10 • macos-12	6m 51s
Python 3.11 • macos-12	6m 42s
Python 3.12 (with Praat tests) • macos-12	18m 52s
Python 3.8 (Release) • macos-12	9m 48s
Python pypy-3.7 • macos-12	9m 26s
Python pypy-3.8 • macos-12	8m 58s
Python pypy-3.9 • macos-12	7m 45s
Python 3.8 (with Praat tests) • windows-2019	37m 42s
Python 3.9 • windows-2019	14m 53s
Python 3.10 • windows-2019	15m 32s
Python 3.11 • windows-2019	15m 0s
Python 3.12 (with Praat tests) • windows-2019	37m 40s
Python 3.12 (32-bit) • windows-2019	15m 28s
Python 3.12 (Release) • windows-2019	15m 39s
Python pypy-3.6 • windows-2019	17m 29s
Python pypy-3.7 • windows-2019	19m 19s
Python pypy-3.8 • windows-2019	16m 7s
Python pypy-3.9 • windows-2019	16m 10s
	7h 46m 36s

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