Revert "Move {libbacktrace,libunwindstack} from system/core -> system/unwinding/"

This reverts commit 6ad37147a8bfba136a0c0c2e4b5d1eea5495592e.

Reason for revert: The dumps for previous releases don't need to be updated with the latest code. The modification may conflict with the upstream.

Change-Id: Ibd78a3225e6f34e9df66e49679370fff376cc71f
32 files changed
tree: a27ee5fd3b7cecf4f55b2f5f3b51500ba1ac2ab9
  1. 29/
  2. 30/
  3. Android.bp
  4. OWNERS