add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From https://github.com/json-c/json-c/wiki
sha256  b8d80a1ddb718b3ba7492916237bbf86609e9709fb007e7f7d4322f02341a4c6  json-c-0.15.tar.gz
# Locally calculated
sha256  74c1e6ca5eba76b54d0ad00d4815c8315c1b3bc45ff99de61d103dc92486284c  COPYING