Fix issue with retrieving CPU stats in 6.3-STABLE and upper. The problem

is that the cp_time symbol is no longer avaliable in the nevest kernels.
Use kern.cp_time sysctl which has been around for 8 years or so, so that
it should be present virtually in every FreeBSD version that is able
to use modern ports tree (4.x and upper). Sysctl is also better from the
security standpoint, as you don't need elevated privileges to get the data.
One should probably look at converting few others uses of KVM here, but
ENOTIME from me. The patch has been submitted to the vendor.

Approved by:	MAINTAINER

net-mgmt/net-snmp53/Makefile

@@ -7,7 +7,7 @@
 
 PORTNAME=	snmp
 PORTVERSION=	5.3.2
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	net-mgmt ipv6
 MASTER_SITES=	${MASTER_SITE_SOURCEFORGE}
 MASTER_SITE_SUBDIR=	net-snmp

net-mgmt/net-snmp53/files/patch-vmstat_freebsd2.c

@@ -0,0 +1,22 @@
+--- agent/mibgroup/ucd-snmp/vmstat_freebsd2.c.orig	2008-04-25 16:28:53.000000000 +0300
++++ agent/mibgroup/ucd-snmp/vmstat_freebsd2.c	2008-04-25 16:29:01.000000000 +0300
+@@ -174,6 +174,7 @@
+     static long     cpu_total;
+     long            cpu_sum;
+     double          cpu_prc;
++    int		    mib[2], mib_len, cpu_new_len;
+ 
+     static struct vmmeter mem_old, mem_new;
+ 
+@@ -195,7 +196,10 @@
+         /*
+          * CPU usage 
+          */
+-        auto_nlist(CPTIME_SYMBOL, (char *) cpu_new, sizeof(cpu_new));
++	mib_len = 2;
++	sysctlnametomib("kern.cp_time", mib, &mib_len);
++	cpu_new_len = sizeof(cpu_new);
++	sysctl(mib, mib_len, cpu_new, &cpu_new_len, NULL, 0);
+ 
+         cpu_total = 0;
+