add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://www.apache.org/dist/xerces/c/3/sources/xerces-c-3.1.4.tar.xz.sha256
sha256 9973cc79481803f8b6652c52faf5195d963f50d209d4f681ec97e2aa014b6241 xerces-c-3.1.4.tar.xz