add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256  3671ba6051e0f30849942cc66d1798fdf0362d089343a83f704c09ee7156604f  jsoncpp-1.8.3.tar.gz