Merge "Add sysroot property for sysroots." am: 07f412a525 am: b595037c98

Original change: https://android-review.googlesource.com/c/platform/prebuilts/rust/+/1431732

Change-Id: I965ee03f513a5f319af156771ae1bae6478a9819
tree: df61fd1c1984a6563d5baffac9077ca2fb6433f3
  1. bootstrap/
  2. darwin-x86/
  3. linux-x86/
  4. Android.bp
  5. OWNERS