Switch to C11 noreturn to work around a compiler bug in llvm. am: ee301d5ded am: 8b161a8623

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

Change-Id: I7cefd819f8d1e02d6f96cfd86265d86711dfdc25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>