add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  a969332887a18a9c98b0df0ea4d4ca75972f24ca94f06fb87d591377e83414f6  versiontools-1.9.1.tar.gz