Make exit behaviour of jerry_fatal flag-dependent

* Added new flag `JERRY_FLAG_ABORT_ON_FAIL`.
* Added new internal api function `jerry_is_abort_on_fail` to
  check the status of the flag.
* Changed `jerry_fatal` bail-out function to call `abort` when the
  flag is set and exit code is non-zero (i.e., not only for
  assertion failures).
* Added `--abort-on-fail` command line option to linux and nuttx
  apps to set the flag.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/jerry-internal.h

@@ -34,4 +34,7 @@ extern void
 jerry_dispatch_object_free_callback (ecma_external_pointer_t freecb_p,
                                      ecma_external_pointer_t native_p);
 
+extern bool
+jerry_is_abort_on_fail (void);
+
 #endif /* !JERRY_INTERNAL_H */