add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 558e8d8734052bdbe679cf10165a63944c208940ab84be78c97ba661dfcf3cb2 erlang-p1-xmpp-1.1.16.tar.gz