openwrt: fix ntp init to accept link local addr

Currently it seems to be more work to fix the ip validation in
ubox project (validate/validate.c). Therefore we just validate it
as string.

Fixes #9

Signed-off-by: Tim Niemeyer <tim@tn-x.org>
Reviewed-by: Jan Kraus <mayosemmel@gmail.com>
Reviewed-by: Tobias Klaus <tk+ff@meskal.net>

build_patches/openwrt/0009-ntpd-host-as-string.patch

+diff --git package/utils/busybox/files/sysntpd package/utils/busybox/files/sysntpd
+index f73bb83..61cb54c 100755
+--- package/utils/busybox/files/sysntpd
++++ package/utils/busybox/files/sysntpd
+@@ -9,7 +9,7 @@ HOTPLUG_SCRIPT=/usr/sbin/ntpd-hotplug
+ 
+ validate_ntp_section() {
+ 	uci_validate_section system timeserver "${1}" \
+-		'server:list(host)' 'enabled:bool:1' 'enable_server:bool:0'
++		'server:list(string)' 'enabled:bool:1' 'enable_server:bool:0'
+ }
+ 
+ start_service() {