remove support for non-ANSI compilation

@@ -18,10 +18,11 @@
  *
  * CDDL HEADER END
  */
 
 /*
+ * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  */
 
 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
 /*        All Rights Reserved   */

@@ -80,15 +81,11 @@
         comp_t  ac_rw;                  /* blocks read or written */
         char    ac_comm[8];             /* command name */
 };
 
 #if !defined(_KERNEL)
-#if defined(__STDC__)
 extern int acct(const char *);
-#else
-extern int acct();
-#endif
 #endif /* !defined(_KERNEL) */
 
 #if defined(_KERNEL)
 
 void    acct(char);