qpdf 12.2.0

This is qpdf version 12.2.0. This is an accumulation of small bug fixes from the release of 12.1.0, including resolution of some issues found by fuzz testing and some build-related fixes. There is no significant new functionality. This release still allows C++-17. Bumping to C++-20 has been postponed to 12.3.

For a full list of changes from previous releases, please see the release notes. See also README-what-to-download for details about the available source and binary distributions.