gh-139741: Make dist-pdf docs archive build work for macOS
#140837
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Building docs archive in pdf format on macOS is currently unsuccessful. This PR fixes it.
Changes:
--output-syncon macOS, as macOS'smakedoes not yet support the output sync feature.nprocby default; usegetconf _NPROCESSORS_ONLNinstead.Thanks @m-aciek for providing the initial solution and PR suggestion.
📚 Documentation preview 📚: https://cpython-previews--140837.org.readthedocs.build/