add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256    af3f3c0846a1d75baeadae4aa5a2bda427567e2a1fb4559bf73ccff0a4f9a39b    libupnp-1.6.21.tar.bz2