message: Add missing directory to clean_all.sh
diff: #!/bin/bash --verbose
  set -e
  -rm -rf target/ build/ build_sysroot/{sysroot_src/,target/} perf.data{,.old}
  +rm -rf target/ build/ build_sysroot/{sysroot_src/,target/,compiler-builtins/} perf.data{,.old}
  rm -rf rand/ regex/ simple-raytracer/
  