which doesn't want GNU-levels of automake strictness so tell it to be "foreign".
(From OE-Core rev: 5007bfcd6d21beb1e4da2ad1a1fe0dbd1f48a2db)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>