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) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  
  #ifndef _SYS_AVINTR_H
  #define _SYS_AVINTR_H
*** 39,53 ****
   */
  #define MAXIPL  16
  #define INT_IPL(x) (x)
  #define AV_INT_SPURIOUS -1
  
- #ifdef  __STDC__
  typedef uint_t (*avfunc)(caddr_t, caddr_t);
- #else
- typedef uint_t (*avfunc)();
- #endif  /* __STDC__ */
  
  struct autovec {
  
          /*
           * Interrupt handler and argument to pass to it.
--- 40,50 ----