Handle ELF symbols better. This fixes "vmstat -i" for the case
where "/var/db/kvm_kernel.db" exists.

Note, kvm_mkdb tries to be clever, and skips rebuilding the database
if it thinks it's already up to date. To see the effects of this
fix, you may need to manually delete "/var/db/kvm_kernel.db" and
then run "kvm_mkdb".