Remove shadowed declarations, undefined identifiers, and specify argument types where it is required. (#1601)

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com

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

@@ -34,7 +34,7 @@ typedef struct
  * Unit test's main function.
  */
 int
-main ()
+main (void)
 {
   TEST_INIT ();