Add DOCS and DOXYGEN options to allow building/installing
extra documentation.
Cherry-pick a few fixes from the upstream Git repo,
and add one FreeBSD-specific fix to libprocinfo interface
that caused crashes in the test rig, and add
sscanf/printf vs type fixes.
Fix a few things in exiv2 and Adobe XMP SDK found while
test-compiling exiv2 consumers.
All local fixes to .cpp filed with upstream repo as pull req.
While here, reformat/rearrange to please portlint and
portfmt/portclippy.
Assisted and
Reviewed by: diizzy@
PR: 272311
Differential Revision: https://reviews.freebsd.org/D40828
ce4a214fb7