remove support for non-ANSI compilation

*** 18,27 ****
--- 18,29 ----
   *
   * CDDL HEADER END
   */
  
  /*
+  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+  *
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  
*** 325,350 ****
   * These defines are the mode parameter for the checksum routines.
   */
  #define CK_CHECKSUM     0       /* check checksum */
  #define CK_MAKESUM      1       /* generate checksum */
  
- #if defined(__STDC__)
- 
  extern  int     read_vtoc(int, struct vtoc *);
  extern  int     write_vtoc(int, struct vtoc *);
  extern  int     read_extvtoc(int, struct extvtoc *);
  extern  int     write_extvtoc(int, struct extvtoc *);
  
- #else
- 
- extern  int     read_vtoc();
- extern  int     write_vtoc();
- extern  int     read_extvtoc();
- extern  int     write_extvtoc();
- 
- #endif  /* __STDC__ */
- 
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _SYS_VTOC_H */
--- 327,341 ----