pkgsave cleanup

From: Roger Marquis <marquis_at_roble.com>
Date: Sat, 11 Nov 2023 16:14:57 UTC
Wondering if anyone has a patch (for a make flag) to prevent the
creation of .pkgsave files in the same directory as the original?  Would
be ideal to create a tree under say /var/db/pkgsave for these (and a
flag to prevent the rotation of system-critical files such as
master.passwd).

Other than a small pkgsave manual intervention we're up and running
14.0-RELEASE with a packaged base and no issues!

Roger