add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  6fb92f6f5925e0af918ffbb90acf19b7b88706ebcd40fc186b7caa76609b6350  yaml-cpp-0.5.2.tar.gz