zabbix: update to 2.4.0, refresh patches

Signed-off-by: Christoph König <christoph.koenig@gmail.com>
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

admin/zabbix/patches/002-uclibc_loadavg.patch

@@ -1,8 +1,8 @@
 --- a/src/libs/zbxsysinfo/linux/cpu.c
 +++ b/src/libs/zbxsysinfo/linux/cpu.c
-@@ -21,6 +21,45 @@
- #include "sysinfo.h"
- #include "stats.h"
+@@ -62,6 +62,45 @@ int	SYSTEM_CPU_DISCOVERY(AGENT_REQUEST *
+ 	return SYSINFO_RET_OK;
+ }
  
 +
 +/* uclibc and dietlibc do not have this junk -ReneR */