Merge "Add POSIX qsort_r()." into main am: eadd64fbd2

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3199671

Change-Id: I2af2b6dd98978a10bd47da1f8513e8c6f4d48c70
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>