add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 3dc787c1bb6023ba846c2a0d9b1f6e179f1cd255172bde9eb75b01f1e6c7d71a  openjpeg-2.3.0.tar.gz