There may be typos or out of date values in PACKAGECONFIG, check and
warn them.
(From OE-Core rev: be085657bbab34bb8a822682897f96871bb2d8f4)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>