add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 6e29503609bd966fed33dec1a1571b36bbdbc37bf1a828af6722ed0ead192ff1  ljsyscall-v0.12.tar.gz