Merge "_GNU_SOURCE is public; _USE_GNU is an implementation detail." into main am: 0b46c906bb am: 75182316a1

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3361286

Change-Id: I8e94e8daad9cbe915df8bcb20591649dbae40f44
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>