Merge "Add qsort_r to the POSIX header tests." into main am: 75237ed481

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3207590

Change-Id: I78f39a8beaeb319bd95f24ad5745f5d29e07c911
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>