add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    35fb44daa41961f94a0ac1b8f06801e88cc9bf2ad6f562ced8ab7c1f1a875499    libebml-1.3.3.tar.bz2