remove support for non-ANSI compilation

*** 17,26 ****
--- 17,27 ----
   * 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   */
*** 110,124 ****
  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 */
  
--- 111,121 ----