Update Kconfiglib (and menuconfig, just to sync) to upstream revision
094f4a9622046, to add the commit below.
Save existing configuration to .<filename>.old in write_config()
Add a default-True 'save_old' flag to write_config(). If 'save_old' is
True and an existing configuration file is being overwritten, a copy
of the old configuration file is saved to .<filename>.old (e.g.
.config.old) in the same directory.
Errors are ignored, as the old configuration would usually just be a
nice-to-have, and not essential.
The same functionality could be added for minimal configuration files
and headers, but it's probably most useful for configuration files.
Other changes:
- Parsing performance is improved a bit
- scripts/kconfig/kconfig.py now prints the path to the merged
configuration in zephyr/.config, to make it a bit easier to
discover.
Fixes: #2907
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
57b28cae2c