New port: net/openrsync: Implementation of rsync with a BSD (ISC) license

An implementation of rsync, which is compatible with a modern rsync, but
accepts only a subset of rsync's command-line arguments. Has been merged
into OpenBSD base some time ago.

https://github.com/kristapsdz/openrsync

PR: 253973
Submitted by: Timothy Beyer <beyert@cs.ucr.edu> (also maintainer)