old top and new -current: missing arcstat sysctl

[Mark Johnston]

On Tue, Aug 28, 2018 at 08:40:15AM +0200, Alexander Leidinger wrote:
> Hi,
> 
> top reports missing sysctl kstat.zfs.misc.arcstats.other_size for  
> 12.0-alpha3 with a top from an old-ish -current.
> 
> Is/will this be handled via a compat-11 sysctl (my kernel is without  
> compat-xx), or did this slip through?

This should be fixed by r338395.