add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 ff5379b1f5b396103b8bb589ab3dd94d0a727c8e7a48dcfe1c73e2f07af6a8df  basexx-0.4.0-1.src.rock