The new approach is less prone to race conditions and will properly
snapshot the symlinks prepared by the prereq-build target.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44330 3c298f89-4303-0410-b956-a3cf2f4a3e73