Add symlinks to current rustfmt am: 680e4f0a76

Original change: https://android-review.googlesource.com/c/platform/prebuilts/rust/+/1320454

Change-Id: Ie4540e65c29bb6456b8a971ce487a04f8b8451f5
tree: 3fc82ef5d7a3bf7cdf77d583e7f4150e846cb29f
  1. bootstrap/
  2. darwin-x86/
  3. linux-x86/
  4. OWNERS