print/hplip and print/hplip-plugin: Update to 3.16.8

print/hplip:

• Add LICENSE details
• Changes USE_OPENSSL=yes to USES=ssl
• Create empty directories for pkg-plist @dir entries
• Reformat patches with makepatch (pet portlint)
• Move ${PREFIX}/etc/sane.d/dll.conf to ${PREFIX}/etc/sane.d/dll.d/hpaio during post-install, rather than editing ${PREFIX}/etc/sane.d/dll.conf during @exec and @unexec during pkg-plist

print/hplip-plugin:

• Re-order LICENSE block (pet portlint)

Changes this release:

http://hplipopensource.com/hplip-web/release_notes.html

Reviewed by: mat (mentor)
Approved by: makc (maintainer timeout), adamw (mentor)
Differential Revision: https://reviews.freebsd.org/D7812