Introduce JERRY_UNUSED() instead of __attr_unused___

JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com

tests/unit/test-number-to-integer.c

@@ -1,4 +1,4 @@
-/* Copyright 2015 Samsung Electronics Co., Ltd.
+/* Copyright 2015-2016 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,8 +34,7 @@ typedef struct
  * Unit test's main function.
  */
 int
-main (int __attr_unused___ argc,
-      char __attr_unused___ **argv)
+main ()
 {
   TEST_INIT ();