add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  7e6636e400856984c4405ce7bd0843aaa3329fa3efd20c58df8400a9eaa35f09  empty-0.6.20b.tgz