message: Build manpage archive deterministically
  Keep deterministic builds for Cargo! The changes here are:
  * Sort files being added to the archive to ensure they're added in the
  same order on all platforms.
  * Flag the archive builder as "deterministic mode" which means it won't
  pick up fields like mtime.
  Closes
diff: @@ -14,10 +14,15 @@ fn compress_man() {
  .filename("man.tar")
  .write(dst, Compression::best());
  let mut ar = tar::Builder::new(encoder);
  + ar.mode(tar::HeaderMode::Deterministic);
  let mut add_files = |dir, extension| {
  - for entry in fs::read_dir(dir).unwrap() {
  - let path = entry.unwrap().path();
  + let mut files = fs::read_dir(dir)
  + .unwrap()
  + .map(|e| e.unwrap().path())
  + .collect::<Vec<_>>();
  + files.sort();
  + for path in files {
  if path.extension() != Some(extension) {
  continue;
  }
  