Before this patch the usage of cache was quite useless as the file
checksums were not actually cached on disk but re-calculated every time.
This patch utilises the new writeout_file_checksum_cache() method of the
SignatureGenerator class to do the job.
(Bitbake rev: 5ac9cbf405841ed3f65e6f99a3cee032567fb182)
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>