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2019-02-09Improve upgradability of defconfig filesAlexey Neyman3-0/+488
- Switch to two-pass reading of the config file to track both (a) the option's value and (b) if the option has been explicitly called out in the .config being processed. - Split off per-version functions into separate files. - Add a README with some guidelines on writing new upgrade scripts. Signed-off-by: Alexey Neyman <stilor@att.net>