add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://www.tarsnap.com/scrypt/scrypt-sigs-1.2.0.asc
sha256 1754bc89405277c8ac14220377a4c240ddc34b1ce70882aa92cd01bfdc8569d4  scrypt-1.2.0.tgz