message: Avoid empty link and include arguments when probing with cmake
diff: @@ -580,7 +580,9 @@ impl Library {
  .and_then(|output| {
  if output.status.success() {
  let mut include_paths = Vec::with_capacity(4);
  - for mut arg in Shlex::new(&String::from_utf8(output.stdout)?) {
  + let stdout = String::from_utf8(output.stdout)?;
  + eprintln!("=== cmake include arguments: {:#?}", stdout);
  + for mut arg in Shlex::new(stdout.trim()) {
  const INCLUDE_PREFIX: &str = "-I";
  if arg.starts_with(INCLUDE_PREFIX) {
  arg.drain(..INCLUDE_PREFIX.len());
  @@ -619,7 +621,9 @@ impl Library {
  .map_err(Box::<dyn std::error::Error>::from)
  .and_then(|output| if output.status.success() {
  let mut cmake_link_paths = if link_paths.is_some() { HashSet::new() } else { HashSet::with_capacity(4) };
  - for mut arg in Shlex::new(&String::from_utf8(output.stdout)?) {
  + let stdout = String::from_utf8(output.stdout)?;
  + eprintln!("=== cmake link arguments: {:#?}", stdout);
  + for mut arg in Shlex::new(stdout.trim()) {
  const RPATH_PREFIX: &str = "-Wl,-rpath,";
  if arg.starts_with(RPATH_PREFIX) {
  arg.drain(..RPATH_PREFIX.len());
  