ebtables: build fix for 64-bit kernel with 32-bit userland

Fixes bug #6602.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ebtables/ebtables.mk

@@ -10,10 +10,11 @@ EBTABLES_SITE = http://downloads.sourceforge.net/project/ebtables/ebtables/ebtab
 EBTABLES_LICENSE = GPLv2+
 EBTABLES_LICENSE_FILES = COPYING
 EBTABLES_STATIC = $(if $(BR2_PREFER_STATIC_LIB),static)
+EBTABLES_K64U32 = $(if $(BR2_KERNEL_64_USERLAND_32),CFLAGS+="-DKERNEL_64_USERSPACE_32")
 
 define EBTABLES_BUILD_CMDS
 	$(MAKE) $(TARGET_CONFIGURE_OPTS) LIBDIR=/lib/ebtables $(EBTABLES_STATIC) \
-		-C $(@D)
+		$(EBTABLES_K64U32) -C $(@D)
 endef
 
 ifeq ($(BR2_PREFER_STATIC_LIB),y)