add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  f4ca8a7f0be67e3d710c0633dd9aadab6881203c31cb9eb9be4f10361ad3f937  python-pysendfile-2.0.1.tar.gz