Merge "<netinet/in6.h>: don't require <string.h>." into main am: 3f8d8902bb

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3205703

Change-Id: I0941fde744421ac1fd44d3796665d28e05420b44
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>