Recently, there was added libcap-ng to OpenWrt packages feed,
which is optional for Knot DNS. It enables POSIX 1003.1e capabilities.
This can restrict root (by default it runs as root) permissions and
might harm and as there isn't systemd on OpenWrt it can interfere.

There is an added patch, which introduced an option to disable libcap-ng.
This will be part of the next release.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>