add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 aeda4051c08b78e2f036d82705433a667d03736f07ff0054862e82105435e285 erlang-p1-xml-1.1.25.tar.gz