message: Remove less of the sysroot build dir on recompilation
diff: @@ -168,11 +168,10 @@ fn build_clif_sysroot_for_triple(
  let build_dir = Path::new("build_sysroot").join("target").join(triple).join(channel);
  if !super::config::get_bool("keep_sysroot") {
  - // Cleanup the target dir with the exception of build scripts and the incremental cache
  - for dir in ["build", "deps", "examples", "native"] {
  - if build_dir.join(dir).exists() {
  - fs::remove_dir_all(build_dir.join(dir)).unwrap();
  - }
  + // Cleanup the deps dir, but keep build scripts and the incremental cache for faster
  + // recompilation as they are not affected by changes in cg_clif.
  + if build_dir.join("deps").exists() {
  + fs::remove_dir_all(build_dir.join("deps")).unwrap();
  }
  }
  