add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://lists.gnu.org/archive/html/info-gnu/2017-02/msg00003.html
sha1 df981672a612639ad0934e3fa6546a41d2feb99e ddrescue-1.22.tar.lz