add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256  28abfaacc0f2ddae962afbbca862a7fb619c33a99a497be9edd746091013dd7f  tekui-1.12.tgz