[ANNOUNCE] DESTDIR now default

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

Hi!

To make it as obvious as possible:

The default for building packages is now using DESTDIR.
Packages that do not support DESTDIR now produce a warning to that
effect.

(DESTDIR means that packages are installed into a temporary directory,
then a binary package is built, and finally the binary package is
installed.)

If you are using a package that warns you this way, please convert it
to use DESTDIR (there are about 100 of them left). The pkgsrc guide
has instructions for it in section 19.6.4 "Adding DESTDIR support to
packages".

We're aiming to mark packages that are not DESTDIR-capable break their
build before the next branch.
 Thomas