add ldns scroll

Signed-off-by: Mattias Andrée <maandree@operamail.com>
libpcap is a make- and optdeps of ldns

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add libpcap scroll

Signed-off-by: Mattias Andrée <maandree@operamail.com>