add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  a7c6ea83bd53da75ae04a7b7a25fe7c597b4e9ff1f93d46f4502e3fa8a2cb950  ptpd-1.1.0.tar.gz