add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 c5a2a0030fcc728022fa2332bad85569084d1c3b9a59587b7ebe141b0532acad  heimdal-7.5.0.tar.gz