Having added writing out of the task signature list to buildhistory
(when BUILDHISTORY_FEATURES includes "task"), we now need a way to
compare the list. This just shows which tasks have been added / changed
signature / removed.
(From OE-Core rev: 63bd7e9f780a98dda458d612877495756bcc5463)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>