add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  9743539ed787ea9bd5bb348265cebdd5adcbf820ad329bf44c28bc69ab4c7cd8  xxhash-r40.tar.gz