These variables should not influence the config hash, i.e. changing them
shouldn't trigger a reparse of the metadata, so whitelist them.
(From OE-Core rev: 8feb51267647d0760f5bec3a8b6f95f4481d9b0d)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>