Fix a build regression caused by r39975 by making sure $(STAGING_DIR)/host
directory exists before trying to copy files to it.
Cc: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40998 3c298f89-4303-0410-b956-a3cf2f4a3e73