add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  e4eb6c074bbab168ac47b947c195ff8cef9d51a211cdd18ca9c9ef34d27a373e  libmcrypt-2.5.8.tar.gz