add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# sha256 locally computed
sha256 3c425c0264f253fc5cc2ba969abe667d77703c728770bd4b23c456cbe5e082ef  gnuchess-6.2.4.tar.gz