Use ErrnoNumberAsString from libbase am: 84fe9da3c2 am: 2900d822e0 am: 2d79103d77

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1931290

Change-Id: Ibdc8c245069184c6f5dd6d340fa71fe548754eef