add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from https://pypi.python.org/pypi/u-msgpack-python/json, sha256 locally computed
md5    f5adfb3e19910d8a41e331d3b03aa7c6  u-msgpack-python-2.2.tar.gz
sha256    cdd5a88f2313856a6a9f481f652dab9edd5731059badbb0111280f27249930d7  u-msgpack-python-2.2.tar.gz