add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    cd948e89cd2d8825fab4a6fb0323f810948d934af7d92c9ee8b5e9e1350e52d7    rrdtool-1.6.0.tar.gz