add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# check src/llvm-project/llvm/CMakeLists.txt for llvm version in use
#
LLVM_RELEASE = "12.0.1"
require rust-source-${PV}.inc
require rust-llvm.inc