add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 d8f3dde21b2e0d76740f374385817c11b3fd69b095a186a6dd12c7b0ba0cca8f  mcelog-v153.tar.gz