openvpn: Fix paths to external utilities

This sets paths to ifconfig, route, netstat and ip
in the target root filesystem.

Otherwise the paths leak from the host and may not
match those on the target.

Signed-off-by: Valentine Barshak <gvaxon@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/openvpn/openvpn.mk

@@ -6,7 +6,16 @@
 
 OPENVPN_VERSION = 2.2.2
 OPENVPN_SITE = http://swupdate.openvpn.net/community/releases
-OPENVPN_CONF_OPT = --enable-small --disable-plugins
+OPENVPN_CONF_OPT = --enable-small --disable-plugins \
+			--with-ifconfig-path=/sbin/ifconfig \
+			--with-route-path=/sbin/route \
+			--with-netstat-path=/bin/netstat
+
+ifeq ($(BR2_PACKAGE_IPROUTE2),y)
+OPENVPN_CONF_OPT += --with-iproute-path=/sbin/ip
+else
+OPENVPN_CONF_OPT += --with-iproute-path=/bin/ip
+endif
 
 ifeq ($(BR2_PACKAGE_OPENVPN_LZO),y)
 	OPENVPN_DEPENDENCIES += lzo