Another FreeBSD fix from Matthias Andree

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
libbb: FreeBSD fix for B<num> baud rate constants not fitting into a short.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ntpd: adjust last packet's recv time after a step

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>