[automerger skipped] Support DNS64 synthesis using externally-discovered...

[automerger skipped] Support DNS64 synthesis using externally-discovered prefixes. am: 346737c0 am: f697187a am: e37b2b98 -s ours

am skip reason: Change-Id I7c63fb62b70635a1b5cc7a21d60f091ba2705d72 with SHA-1 346737c0 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/11593902

Change-Id: Ib1d29f3af6555bfe75053ff4f1cd95558faa4c3b