message: Skip creating sysroot target dir if it will be empty
diff: @@ -103,6 +103,10 @@ struct SysrootTarget {
  impl SysrootTarget {
  fn install_into_sysroot(&self, sysroot: &Path) {
  + if self.libs.is_empty() {
  + return;
  + }
  +
  let target_rustlib_lib = sysroot.join("lib").join("rustlib").join(&self.triple).join("lib");
  fs::create_dir_all(&target_rustlib_lib).unwrap();
  