zabbix: update to 2.4.2

Remove 001-cross_compile.patch, it's fixed upstream (ZBX-5561)
Run tested on ar71xx

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
monit: update to 5.10

Run tested on ar71xx

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>