prepare a old config for make menuconfig#21

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cjacker wants to merge 2 commits intobouffalolab:mainfrom cjacker:build_fix

+13-2

Commits on Mar 2, 2023

add old config for make menuconfig, otherwise it will try to genenate config from /boot/config-kernelver of host
Cjacker
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if no arg given, show help
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