add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256    b769620c1b52d6c1548c6c4f055613f4eee3120ed8a5cff4ba4ffbbc8a582286  bitstring-3.1.5.tar.gz