bitbake: data_smart: Fix bug with overrides and weak default values
(aka pay the cookie monster for weak defaults)
If you have code like:
MYVAR = "a"
MYVAR_override ??= "b"
then MYVAR will get the value "a" even when override is in OVERRIDES. The
reason is that the value of ??= is set as a flag not a value and the cookie
monster isn't paid.
The fix is to ensure appropriate payment is made for a defaultval varflag
matching the usual setVar case.
(Bitbake rev:
3d8044bc79c482c5ea008ddf12a8128dcd1527ee)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>