Remove RUN_DEPENDS on nagios-plugins; replace with conditional
directory creation/removal for nagios plugin path in pkg-plist.
Bump PORTREVISION.
Build appears to be OK now on ia64.
Add new port nagios-snmp-plugins, which contains plugins to monitor
disk and cpu usage remotely via SNMP, using the UCD-SNMP-MIB
dskTable and prTable entitites.