library: std: motor: use OS' process::exit in abort_internal

abort_internal() is used in panics; if it calls
core::intrinsics::abort(), the process triggers an
invalid op code (on x86_64), which is a much harder "abort"
than a user-controlled exit via a panic.

Most other OSes don't use core::intrinsics::abort() here,
but either libc::abort(), or a native OS abort/exit API.

Author: lasiotus

library/std/src/sys/pal/motor/mod.rs

@@ -42,5 +42,5 @@ pub fn unsupported_err() -> io::Error {
 }
 
 pub fn abort_internal() -> ! {
-    core::intrinsics::abort();
+    moto_rt::process::exit(-1)
 }