zabbix: bump to 2.0.11

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
zabbix-frontend: bump to 2.0.11

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
zabbix-agent: bump to 2.0.11

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>