olsrd: switch to firewall4

Firewall4 uses nftables instead of iptables. Use iptables-nft for
installing smart-gw-rules.

Fixes: openwrt#731 ("Certain upstream switch to firewall4 aka nftables instead
of iptables")

Signed-off-by: Nick Hainke <[email protected]>

Author: PolynomialDivision

olsrd/Makefile

@@ -34,7 +34,7 @@ endef
 define Package/olsrd
   $(call Package/olsrd/template)
   MENU:=1
-  DEPENDS:=+libpthread +libubus
+  DEPENDS:=+libpthread +libubus +iptables +ip6tables
 endef
 
 define Package/olsrd/conffiles