add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256  c8c862b0e9a7ba699a49bc98f62bdffdfafd53a5716c0e162696b4bf108d3637  libmodbus-3.1.4.tar.gz