build: force a valid config at each step
If you re-build after stuff has been added to Kconfig, the .config you
already have in place is wrong. This means the dot-config at runtime
will have missing items.
We thus force a silent "make oldconfig" at each build step, to ensure
user preverences are saved, but new options get the default value.
Signed-off-by:
Alessandro Rubini <rubini@gnudd.com>
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