Log Message:
If  XLOCK_DISABLE_ALLOW_ROOT is defined, add --disable-allow-root
to configure options to prevent root from being able to get into
locked systems. Esp useful if you don't have a root password set (yes
there are people out there doing that :).

Patch contributed by Eirik Nygaard <eirikn@kerneled.com>.

Bump revision to 5.19nb1.