The original expanded to 16 nibbles which is technically correct because
the standard defines USHRT_MAX as being at LEAST 65535. However, in
practice everything seems to set the max as the max length of two bytes.

This header is more or less the same across libc implementations.

`musl` uses its `_Noreturn` macro to detect which `noreturn`
should be used: C11 or GCC's extension as a fallback.

`glibc` simply defines `noreturn` as `_Noreturn`.

This implementation is based off of `musl`'s.

`_Noreturn` is deprecated as of C23.