ndisc6: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ndisc6/ndisc6.mk

@@ -9,6 +9,8 @@ NDISC6_SOURCE = ndisc6-$(NDISC6_VERSION).tar.bz2
 NDISC6_SITE = http://www.remlab.net/files/ndisc6/
 NDISC6_CONF_ENV = CC="$(TARGET_CC) -std=gnu99"
 NDISC6_CONF_OPT = --localstatedir=/var --disable-rpath --disable-suid-install
+NDISC6_LICENSE = GPLv2 or GPLv3
+NDISC6_LICENSE_FILES = COPYING
 
 ifeq ($(BR2_NEEDS_GETTEXT_IF_LOCALE),y)
 NDISC6_DEPENDENCIES += gettext