add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://lists.x.org/archives/xorg-announce/2014-October/002485.html
sha256    0ef8490ff1dede52b7de533158547f8b454b241aa3e4dcca369507f66f216dd9    xcb-util-keysyms-0.4.0.tar.bz2