add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  23e3b10a8d8a1e2fb071047144222c43d150748ce6670e5d047ba5b0502ad0b2  qextserialport-ada321a9ee463f628e7b781b8ed00ff219152158.tar.gz