add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256  da7df7ff359a9829e9e6ef98dfe9fead0cf735b8a4a5da1b1047f467dee1b2a9  bctoolbox-0.4.0.tar.gz