fix: Fix clang ast can not find the std headers in some systems #47
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In some systems, if the llvm path spefic to the
PATHenvironment variables, the clang AST will run with error that can not find the std headers, e.g.,/opt/homebrew/opt/llvm@15/include/c++/v1/stdio.h:107:15: fatal error: 'stdio.h' file not found.So we filter the llvm path from the
PATHto run the clang AST, it's a little tricky but for a workaround.