Build timestamp are not reproducible [0].

[0] https://reproducible-builds.org/docs/timestamps/

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

Update to latest stable version and add init script and config file to start
horst in server mode as a service.

Signed-off-by: Bruno Randolf <br1@einfach.org>

Fortified headers don't seem to like _GNU_SOURCE in this case,
but we can remove that define since it's not needed. Add a patch
for LEDE until a new horst version is released.

Signed-off-by: Bruno Randolf <br1@einfach.org>