Initial update for cups-pdf

This optional update introduces cups-pdf to 42.2.

cups-pdf is a PDF writer backend or CUPS.
It provides a virtual CUPS-PDF printer which produces PDF file so that
application programs which have no built-in support to "Save as PDF"
could print to CUPS-PDF to get a PDF file.

Fixed bugs
Leap 42.2 lacks a virtual PDF printer
Selected Binaries
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