Merge "Add a test for a recent POSIX change." am: cfb9030ff0

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2638673

Change-Id: I1a51e5f853d8570fe4f54302efe8d09b642be16f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>