system.cpu.switches not supported in zabbix agent pre2.0

broken in rev 19752 in ZBXNEXT-677

1. ./zabbix_agentd --test system.cpu.switches
   system.cpu.switches [u|955691993]
2. ./zabbix_agentd -V
   Zabbix Agent (daemon) v1.8.11rc1 (revision 25166) (28 December 2011)
   Compilation time: Feb 2 2012 14:34:06

1. zabbix_agentd --test system.cpu.switches
   system.cpu.switches [m|ZBX_NOTSUPPORTED]
2. zabbix_agentd -V
   Zabbix Agent (daemon) v1.9.10 (revision 25173) (01 February 2012)
   Compilation time: Feb 2 2012 13:33:11