Add fetching and installing of the 'dnet' codec from the collection,
that came with the version 9 of the player. For licensing reasons Real
no longer ships the codec and considers it obsolete.
It is, however, in use by some major content providers -- most notably
Amazon (samples of CD audio tracks). Tested on 6.x/amd64 and 5.x/i386.
Instead of bumping PORTREVISION, change the PORTVERSION to include the
vendor's "nano-version" (PORTVERSION is now 10.0.6.776).
There really ought to be some rejoicing...