disable libubox like we use a more recent one.

bsp/buildroot/package/libubox/Config.in

@@ -1,13 +0,0 @@
-config BR2_PACKAGE_LIBUBOX
-	bool "libubox"
-	depends on !BR2_STATIC_LIBS
-	help
-	  This library originates from the OpenWrt project to
-	  handle the configuration file infrastructure, but can
-	  also be used for the same purposes in projects other
-	  than OpenWrt.
-
-	  http://nbd.name/gitweb.cgi?p=luci2/libubox.git;a=summary
-
-comment "libubox needs a toolchain w/ dynamic library"
-	depends on BR2_STATIC_LIBS

bsp/buildroot/package/libubox/libubox.mk

@@ -1,22 +0,0 @@
-################################################################################
-#
-# libubox
-#
-################################################################################
-
-LIBUBOX_VERSION = e88d816d6e462180f0337565e04e36be58a63309
-LIBUBOX_SITE = git://git.openwrt.org/project/libubox.git
-LIBUBOX_LICENSE = LGPLv2.1, GPLv2, BSD-3c, MIT
-LIBUBOX_INSTALL_STAGING = YES
-LIBUBOX_DEPENDENCIES = $(if $(BR2_PACKAGE_JSON_C),json-c)
-
-ifeq ($(BR2_USE_MMU)$(BR2_PACKAGE_LUA_5_1),yy)
-LIBUBOX_DEPENDENCIES += lua
-LIBUBOX_CONF_OPTS += -DBUILD_LUA=ON \
-	-DLUAPATH=$(STAGING_DIR)/usr/lib/lua/5.1 \
-	-DLUA_CFLAGS=-I$(STAGING_DIR)/usr/include
-else
-LIBUBOX_CONF_OPTS += -DBUILD_LUA=OFF
-endif
-
-$(eval $(cmake-package))