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) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
  */
 
 #ifndef _SYS_AVINTR_H
 #define _SYS_AVINTR_H

@@ -39,15 +40,11 @@
  */
 #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.