add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 c1488ee08e5d25d59a11e19cb0322edae509202b246d0c93cb2de1676dbfdf2b  coxpcall-1.16.0-1.src.rock