New port: sysutils/dupd

dupd is a file duplicate detection CLI utility, supporting iterative
interactive use with a persistent file database.

Despite the name, it doesn't run as a daemon.

See https://elipapa.github.io/blog/fastest-way-to-find-dups.html for
a comparison of such tools.

WWW: http://www.virkki.com/dupd/

PR: 218664
Submitted by: Thomas Hurst <tom@hur.st>