add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  5a79c7516ff7560dffc6a14399a389432bc619c905b13d3b73da22fa65acede0  madplay-0.15.2b.tar.gz