[PRQ#61886] Merge Request for pdfbox-preflight

MarsSeed [1] filed a request to merge pdfbox-preflight [2] into pdfbox [3]: The 'preflight' (preflight-app) feature has been merged into upstream's stable pdfbox release. See "Features" section on main web page. [a] Therefore the separate 'pdfbox-preflight' package has become obsolete. [a]: https://pdfbox.apache.org/ [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/pdfbox-preflight/ [3] https://aur.archlinux.org/pkgbase/pdfbox/