Merge "libutil: no special copy from StaticString16" am: 7d067aee62 am: ece939ecc9 am: b8e683537f am: 73fcfd0c52

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1751786

Change-Id: I5cc9831a8a940cdead57b4a0811e55eec34092ef