Remove jerry_reg_err_callback API function

Discussions on Termination Port API point in a different direction
than what's already in the API. Moreover, since the function has
been throwing unimplemented assert error since its introduction,
we should remove it from the code base.

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

jerry-core/jerry.c

@@ -1712,17 +1712,6 @@ jerry_is_abort_on_fail (void)
   return ((jerry_flags & JERRY_FLAG_ABORT_ON_FAIL) != 0);
 } /* jerry_is_abort_on_fail */
 
-/**
- * Register Jerry's fatal error callback
- */
-void
-jerry_reg_err_callback (jerry_error_callback_t callback) /**< pointer to callback function */
-{
-  jerry_assert_api_available ();
-
-  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS ("Error callback is not implemented", callback);
-} /* jerry_reg_err_callback */
-
 /**
  * Parse script for specified context
  *