ntp-signd support for Samba4

[John Lane <archlinux@xxxxxxxxxxx>]

Now that Samba 4 is the deault, I think the ntp package needs to be 
configured with '--enable-ntp-signd' because this is needed for Active 
Directory clients to be able to synchronize time via the Active 
Directory component of Samba 4. As far as I know this is necessary but 
the wiki makes no mention of it so I may of course be wrong.... Does 
anybody else know more about this?