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

main-nuttx.cpp

@@ -166,6 +166,10 @@ int jerry_main (int argc, char *argv[])
     {
       flags |= JERRY_FLAG_SHOW_OPCODES;
     }
+    else if (!strcmp ("--abort-on-fail", argv[i]))
+    {
+      flags |= JERRY_FLAG_ABORT_ON_FAIL;
+    }
     else
     {
       file_names[files_counter++] = argv[i];