add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  a6b1bc6b3900954438a0f1a316bac5f74171125a88c80c35e137f4ca512dedc6  owl-linux-1.0.7.tar.gz