zabbix20: Update to new upstream version 2.0.8.
zabbix20: Update to new upstream version 2.0.8.

Upstream changes for version 2.0.7:

http://www.zabbix.com/rn2.0.7.php

Upstream changes for version 2.0.8:

http://www.zabbix.com/rn2.0.8.php

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

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