add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed hash
sha256 ce9090ef80b6035a744a9b5ac335e61c99baa92c39ff53277266fbfcb836445a udpcast-20120424.tar.gz