add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  9c87f80fc651b900772deaef0ab154b63160c74d292529b5be6d06d6485d4640  msgpack-2.1.5.tar.gz