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This is needed to get an old enough version of glibc to run the Linux binary as an AWS Lambda layer and to support some versions of CentOS.
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18.04 is out of security support, and cmake for 18.04 is no longer available via kitware's debian repository (or at least fetching it failed for one build).
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Also remove linearization from qpdf-manual.pdf. It's a small file, and removing the dependency on the qpdf executable significantly shortens build times.
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The official, signed AppImage will be build locally for now for security of my key, but I still want it to be built in a clean, controlled environment based off a suitably old Linux distribution for maximal portability in the AppImage.