add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://ftp.de.debian.org/debian/pool/main/d/debianutils/debianutils_4.8.1.dsc
sha256    2c395c0bdcfe89de30828b1d25cc5549ded5225a6d3625fbcb2cc0881ef5f026    debianutils_4.8.1.tar.xz