ebtables: fix download url

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/ebtables/ebtables.mk

@@ -6,7 +6,7 @@
 
 EBTABLES_VERSION = 2.0.10-4
 EBTABLES_SOURCE = ebtables-v$(EBTABLES_VERSION).tar.gz
-EBTABLES_SITE = http://downloads.sourceforge.net/project/ebtables/ebtables/ebtables-$(EBTABLES_VERSION)
+EBTABLES_SITE = http://downloads.sourceforge.net/project/ebtables/ebtables/ebtables-$(subst .,-,$(EBTABLES_VERSION))
 EBTABLES_LICENSE = GPLv2
 EBTABLES_LICENSE_FILES = COPYING
 EBTABLES_STATIC = $(if $(BR2_PREFER_STATIC_LIB),static)