buildroot

dc3dd: new package

We actually prefer the version 7.2.641 (over 7.2.646) as the
content of the release is identical and the 641 has the advantage
of providing a proper .tar.xz file.

Signed-off-by: Benoît Allard <benoit.allard@greenbone.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>