net/rsync: Remove duplicate entries in distinfo

This is a quick fix to unbreak the port.

The issue was caused by multiple additional patched
coming from the same distfile archive. If you enable
more than one of those options makesum script add a
distinfo description for each option.

PR: 265896
(cherry picked from commit 1c2e6a5f3eeeae1b80acd25e32ada9685804ec8b)