busybox: force ipv6 build

Since it isn't optional any more just force IPv6 on in busybox to avoid
problems.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/busybox/busybox.mk

@@ -97,18 +97,10 @@ define BUSYBOX_SET_LARGEFILE
 	$(call KCONFIG_ENABLE_OPT,CONFIG_FDISK_SUPPORT_LARGE_DISKS,$(BUSYBOX_BUILD_CONFIG))
 endef
 
-# If IPv6 is enabled then enable basic ifupdown support for it
-ifeq ($(BR2_INET_IPV6),y)
 define BUSYBOX_SET_IPV6
 	$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_IPV6,$(BUSYBOX_BUILD_CONFIG))
 	$(call KCONFIG_ENABLE_OPT,CONFIG_FEATURE_IFUPDOWN_IPV6,$(BUSYBOX_BUILD_CONFIG))
 endef
-else
-define BUSYBOX_SET_IPV6
-	$(call KCONFIG_DISABLE_OPT,CONFIG_FEATURE_IPV6,$(BUSYBOX_BUILD_CONFIG))
-	$(call KCONFIG_DISABLE_OPT,CONFIG_FEATURE_IFUPDOWN_IPV6,$(BUSYBOX_BUILD_CONFIG))
-endef
-endif
 
 # If we're using static libs do the same for busybox
 ifeq ($(BR2_STATIC_LIBS),y)