add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256    cacf0142b31ca1af00796b4a0339e07992ac5f21bc3f81e7532fe1b5e1b486e6    doom19s.zip