posix

add entrypoint.txt for pyconf-pypi, cleanup #632

Job	Run time
build (macos-14, x86_64, 1, macosx)	12m 49s
build (ubuntu-latest, x86_64, 1, 2014, manylinux)	15m 45s
build (ubuntu-latest, x86_64, 0, 2014, manylinux)	15m 45s
build (ubuntu-latest, i686, 0, 2014, manylinux)	13m 36s
build (ubuntu-24.04-arm, aarch64, 1, _1_2, musllinux)	9m 29s
build (ubuntu-24.04-arm, ppc64le, 1, 2014, manylinux)	34m 23s
build (ubuntu-24.04-arm, aarch64, 1, 2014, manylinux)	10m 4s
build (ubuntu-24.04-arm, aarch64, 0, 2014, manylinux)	11m 11s
build (ubuntu-latest, x86_64, 0, _1_2, musllinux)	16m 9s
build (macos-14, x86_64, 0, macosx)	12m 51s
build (ubuntu-24.04-arm, s390x, 0, 2014, manylinux)	27m 58s
build (macos-latest, arm64, 0, macosx)	15m 22s
build (ubuntu-24.04-arm, aarch64, 0, _1_2, musllinux)	10m 6s
build (macos-latest, arm64, 1, macosx)	10m 36s
build (ubuntu-latest, x86_64, 1, _1_2, musllinux)	15m 49s
build (ubuntu-24.04-arm, s390x, 1, 2014, manylinux)	27m 19s
build (ubuntu-24.04-arm, ppc64le, 0, 2014, manylinux)	33m 24s
	4h 52m 36s

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