add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 c058b2e4321ba6adaa656976c1a138c07b18fc03b29f5b82880d5d8228fbf059  bullet-2.86.1.tar.gz