add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  0cc8bfd2a7cbba2f68e0c5767477634922287943c91dd9fcf029fc8b9d577858  fxload-2008_10_13.tar.gz