add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  07267a3951038ee2e02d26cc41bf8e275668c38f751240d3e78dc979182e7376  libjson_7.6.1.zip