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.h

@@ -40,6 +40,7 @@ typedef uint32_t jerry_flag_t;
 #define JERRY_FLAG_PARSE_ONLY             (1u << 4) /**< parse only, prevents script execution (only for testing)
                                                      *   FIXME: Remove. */
 #define JERRY_FLAG_ENABLE_LOG             (1u << 5) /**< enable logging */
+#define JERRY_FLAG_ABORT_ON_FAIL          (1u << 6) /**< abort instead of exit in case of failure */
 
 /**
  * Error codes