add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  87d66da2170facabf6f2fc073586ae2c7320d4689980cfca415c74688e499ba0  ccrypt-1.10.tar.gz