Merge "Remove unused libbacktrace library." am: f7e6b7f424 am: 341de04dee am: 9ef141bd2a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1807719

Change-Id: I4c9e002470b4e82ca8d52c43b21cf0d6547a04a4