add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  76428e96df0ae9dd964c7a7c74c1e9a837e2f312c39e9a357fa8178f7eff80da  jamvm-2.0.0.tar.gz