zabbix: Bump to latest version
This upgrade zabbix to the newest version. Changing SQLite for PostgreSQL, because of dropping SQLite support for server/frontend.
More info:https://www.zabbix.com/documentation/3.4/manual/installation/upgrade_notes_340#dropping_sqlite_support_for_serverfrontend
In addition added required dependencies.
More info:https://www.zabbix.com/documentation/3.4/manual/installation/requirements
Compile tested: Yes, brcm2708
Run tested: Yes, brcm2708
Signed-off-by: Krystian Kozak <krystian.kozak20@gmail.com>