remove support for non-ANSI compilation

@@ -17,10 +17,11 @@
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
+ * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  * Copyright (c) 1987, 2010, Oracle and/or its affiliates. All rights reserved.
  */
 
 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
 /*        All Rights Reserved   */

@@ -110,15 +111,11 @@
 extern int swapctl(int, void *, int *);
 #if defined(_LP64) && defined(_SYSCALL32)
 extern int swapctl32(int, void *, int *);
 #endif /* _LP64 && _SYSCALL32 */
 #else /* !_KERNEL */
-#if defined(__STDC__)
 extern int swapctl(int, void *);
-#else
-extern int swapctl();
-#endif
 #endif /* _KERNEL */
 
 
 /* ste_flags values */