remove support for non-ANSI compilation

*** 18,27 ****
--- 18,28 ----
   *
   * 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   */
*** 80,94 ****
          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);
--- 81,91 ----