add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  2164592a67b467e5b20fdcdaf5bd4c50685199067391c6fcad4fa5521c9b4dd7  fdk-aac-0.1.5.tar.gz