openvswitch: fixup kernels for older versions

Signed-off-by: Steven Barth <steven@midlink.org>

net/openvswitch/Makefile

@@ -24,7 +24,7 @@ PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE_VERSION:=58be9c9fd732b5bdd3d4c2e9b8cc2313f570094d
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 
-SUPPORTED_KERNELS:=LINUX_3_18||LINUX_4_0
+SUPPORTED_KERNELS:=LINUX_3_8||LINUX_3_10||LINUX_3_13||LINUX_3_14||LINUX_3_18||LINUX_4_0
 
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/kernel.mk