add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated after checking pgp signature
sha256    b5976e3857837e7617b29f2249ebb5eeac34e249208d31f1fbf7a6ba7a4090ce    libxslt-1.1.29.tar.gz
sha256 7e48e290b6bfccc2ec1b297023a1d77f2fd87417f71fbb9f50aabef40a851819  COPYING