add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 6b8b5238047f1613d99149bb02d5ed3384675f3ce74a0a8ba25290bd61abc06c  xscreensaver-5.36.tar.gz