Merge "Remove unused libbacktrace library." am: f7e6b7f424 am: 341de04dee am: 1b8a6843d6

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

Change-Id: I4cfa9cf423ea1eb41488985d84b28179c872e0e0