Merge "libc++fs is part of libc++ now." into main am: 94c82c1a5b am: 59cb8b37d0

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/3113943

Change-Id: Ic6ddb8005cf03beff0f78aef29d90a9ffca38b12
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>