sys-cluster/csync2: Removal, last-rite in ::gento

I suggest we remove sys-cluster/csync2. It has been last-rited in ::gentoo with removal on 2022-07-15 due to dead upstream and security issues:

# John Helmert III <ajak@gentoo.org> (2022-06-15)
# Open security bug with patches for years. Upstream seems dead since
# 2020. Removal on 2022-07-15.  Bug #718550.

Edited Jul 14, 2022 by Adrian Schollmeyer

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