Log message:
Remove mk/find-prefix.mk usage from the archivers category.

The find-prefix infrastructure was required in a pkgviews world where
packages installed from pkgsrc could have different installation
prefixes, and this was a way for a dependency prefix to be determined.

Now that pkgviews has been removed there is no longer any need for the
overhead of this infrastructure.  Instead we use BUILDLINK_PREFIX.pkg
for dependencies pulled in via buildlink, or LOCALBASE/PREFIX where the
dependency is coming from pkgsrc.

Provides a reasonable performance win due to the reduction of `pkg_info
-qp` calls, some of which were redundant anyway as they were duplicating
the same information provided by BUILDLINK_PREFIX.pkg.

Log message:
Add SHA512 digests for distfiles for archivers category

Problems found with existing distfile for eagle:
	distfiles/bicom101.zip
	distfiles/szip-2.1nb3/szip-2.1.tar.gz
	distfiles/xmill-0.9.1.tar.gz
No changes made to these distinfo files.

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Remove pkgviews: don't set PKG_INSTALLATION_TYPES in Makefiles.

Log message:
Retire from pkg maintainership

Log message:
"user-destdir" is default these days

Log message:
Fixed some pkglint warnings.

Log message:
DESTDIR support.

Log message:
Remove MASTER_SITE, it is not reachable. From Zafer Aydogar.