For local files, there are no races with downloads, we don't need ".done"
stamps and we don't need lockfiles.
This considerably cleans up DL_DIR and all the pointless ".done" files
as well as removes stalls over local files with the same name.
(Bitbake rev: 48e903745db578d9b9b425a8d411c1369df0eb94)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>