add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from https://pypi.python.org/pypi/cryptography/json, sha256 locally computed
md5 fade66de437392ed1ba6980768626204 cryptography-1.7.2.tar.gz
sha256 878cb68b3da3d493ffd68f36db11c29deee623671d3287c3f8d685117ffda9a9 cryptography-1.7.2.tar.gz