add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  33a98fd44eb0b6dfa6790c0fcef4d7e73a5cc12a664ea3c30f4d3c2b95f5efc4  python-dpkt-1.8.r98.tar.gz