add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 9947fc705b0b841b5938c48b22dc33e9647ec0752bae66e50278df4f23f64959  go1.4.3.src.tar.gz