add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://ftp.gnome.org/pub/GNOME/sources/libsecret/0.18/libsecret-0.18.5.sha256sum
sha256    9ce7bd8dd5831f2786c935d82638ac428fa085057cc6780aba0e39375887ccb3    libsecret-0.18.5.tar.xz