pkgviews: infrastructure removed

[Thomas Klausner <wiz%NetBSD.org@localhost>]

Hi!

Just to finish this topic: I had already removed the pkgviews-relevant
variables from the pkgsrc packages' Makefiles a couple of months ago.

Yesterday, after the branch was cut, I committed the second part of
the changes, which also removed pkgviews support from the
infrastructure.

Please let me know if you find any breakage caused by this.
(I didn't notice any in my local bulk build.)

Cheers,
 Thomas