Make compile!
Add libmemstat from freebsd-9 into the tree:

* comment out kvm code, we aren't using it
* use the local sysctl code for uma query, malloc stats will come next.
Migrate the malloc path to use u_sysctl.
fix off-by-one comparison.
Add SNMP maxid. Required for memstat consumer.
Add in malloc stats - in case libuinet implements malloc tracking.