Switch to C11 noreturn to work around a compiler bug in llvm. am: ee301d5ded

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/toybox/+/18350067

Change-Id: Ie88ab94fb3bbf1a31072d27f0e16aed0897f130a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>