add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# from http://ftp.gnome.org/pub/GNOME/sources/pygobject/2.28/pygobject-2.28.6.sha256sum
sha256    fb8a1d4f665130a125011659bd347c7339c944232163dbb9a34fd0686577adb8  pygobject-2.28.6.tar.xz