add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256  93c9142d61e6a71ea43b0a266bad7f49f07ce5f5d31b36f8edf4dd386795c483  iozone3_492.tgz