I follow tutorial from [integration-into-xcode](https://github.com/obfuscator-llvm/obfuscator/wiki/Installation#integration-into-xcode), it worked for Xcode 9, In Xcode 10, Select File -> Project/Workspace Setting, there is a Build System option, the new build system is selected as default, with this default setting, the clang path is always set as `/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang`, the value of `ExecPath` from Obfuscator.xcspec file is not respected, how can I make it work with new build system?