add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Computed locally
sha256 386ad455f12bdeb3a7d19280441a5ab77355142349200ff11040a8d9d455d765  autoconf-archive-2017.03.21.tar.xz