print/hplip and print/hplip-plugin: Update to 3.16.10

• FAX option now depends on py-reportlab v3 rather than v2 (deprecated)
• Clean up RUN_DEPENDS syntax and OPTIONS whitespace
• Remove line which set unused variable PYTHON_SITELIBDIR_REL

Changes this release:

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

Approved by: adamw (mentor, implicit)