add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://www.sane-project.org/sane-md5sums.txt
md5 f9ed5405b3c12f07c6ca51ee60225fe7  sane-backends-1.0.25.tar.gz