llgo:pretest embed clang

[luoliwoshang]

llvm build cache

with mac cgo config

with c++17

-Wl,-rpath with llvm

remove CFLAG unset by goplus/llgo#1243 merged

with llgo embed target build test

DRUNTIMES_CMAKE_ARGS set RPATH

clang prefix

linux rpath

-DLLVM_ENABLE_LIBEDIT=OFF

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