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4f86e77bef
Debian and Ubuntu have a patch that changes the upstream default to HAVE_DOT = YES. Undo it to have more consistent results across distros. This was noticed in Ubuntu CI runner where "doxygen" tried to run "dot" but that failed due to "dot" not being installed. "doxygen" still finished with exit status 0 until the commit that turned warnings to errors with WARN_AS_ERROR = FAIL_ON_WARNINGS.