Rollup merge of rust-lang#39660 - alexcrichton:shasum-dirs, r=brson

Don't include directory names in shasums

Right now we just run `shasum` on an absolute path but right now the shasum
files only include filenames, so let's use `current_dir` and just the file name
to only have the file name emitted.

src/tools/build-manifest/src/main.rs

@@ -362,7 +362,8 @@ impl Builder {
  fn hash(&self, path: &Path) -> String {
  let sha = t!(Command::new("shasum")
  .arg("-a").arg("256")
- .arg(path)
+ .arg(path.file_name().unwrap())
+ .current_dir(path.parent().unwrap())
  .output());
  assert!(sha.status.success());