package/ndisc6: bump version to 1.0.4

Changelog:
https://git.remlab.net/gitweb/?p=ndisc6.git;a=blob;f=NEWS



Added license hash.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>