Make libbacktrace buildable for native_bridge

Bug: http://b/153609531

Test: m -j64 libbacktrace.native_bridge

Change-Id: I2b8a881b4e952f3b68dbcaeb14f147a6d955b406
Merged-In: I2b8a881b4e952f3b68dbcaeb14f147a6d955b406
2 files changed
tree: 91d38cf5ca0c646fbd71b010176d1891c28a9cda
  1. libbacktrace/
  2. libunwindstack/