add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256    11a5f5084488c480f3ff5a24d64d7147bb64272bf60a0ba51330a56c5b50cab9  ijs-0.35.tar.bz2