add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 01de52aa123f7bd20e500a076046f6b30d55f8e98c4029ab424bc51c46d7083d  libsilk-4268a02240c35c6055b0f237c46b09b2dcf79e45.tar.gz