allow the crate to be build as rust library #3391

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2 errors and 6 warnings

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

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qpdf 11.9.0 is already installed and up-to-date. To reinstall 11.9.0, run: brew reinstall qpdf

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

checkbashisms 2.23.7 is already installed and up-to-date. To reinstall 2.23.7, run: brew reinstall checkbashisms

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