package/network-manager: drop --disable-ifnet

ifnet has been drop since version 1.12.0 and
https://github.com/NetworkManager/NetworkManager/commit/0474441e2258eeecb356e2aa3cde5c7328828646

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/network-manager/network-manager.mk

@@ -29,8 +29,7 @@ NETWORK_MANAGER_CONF_OPTS = \
 	--without-docs \
 	--with-crypto=gnutls \
 	--with-iptables=/usr/sbin/iptables \
-	--disable-ifupdown \
-	--disable-ifnet
+	--disable-ifupdown
 
 ifeq ($(BR2_PACKAGE_OFONO),y)
 NETWORK_MANAGER_DEPENDENCIES += ofono