message: Remove `-fno-rtti`
diff: @@ -253,7 +253,6 @@ fn get_llvm_cxxflags() -> String {
  .split(&[' ', '\n'][..])
  .filter(|word| !word.starts_with("-W"))
  .filter(|word| word != &"-fno-exceptions")
  - .filter(|word| word != &"-fno-rtti")
  .collect::<Vec<_>>()
  .join(" ")
  }
  