add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    895f768269820e7c0379b0daac3687bda0c670d192ebb7e61e5613a5939ec90b    xvkbd-3.7.tar.gz