Merge "libc: swap strchrnul to llvm-libc for most arches" into main am: 3cac647003

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3368660

Change-Id: I8215d99f922e5b77ca9d46798c262ab6facf6a46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>