remove support for non-ANSI compilation

*** 17,26 ****
--- 17,28 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+  *
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*      Copyright (c) 1988 AT&T */
*** 69,80 ****
  
          /* low 4 bits of sp_flag for counting failed login attempts */
  #define FAILCOUNT_MASK 0xF
  };
  
- #if defined(__STDC__)
- 
  #ifndef _STDIO_H
  #include <stdio.h>
  #endif
  
  /* Declare all shadow password functions */
--- 71,80 ----
*** 91,111 ****
  
  extern int      putspent(const struct spwd *, FILE *);
  extern int      lckpwdf(void);
  extern int      ulckpwdf(void);
  
- #else
- 
- /* Declare all shadow password functions */
- 
- struct spwd     *getspent_r(), *fgetspent_r(), *getspnam_r();
- void            setspent(), endspent();
- struct spwd     *getspent(), *fgetspent(), *getspnam(); /* MT-unsafe */
- int             putspent(), lckpwdf(), ulckpwdf();
- 
- #endif
- 
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _SHADOW_H */
--- 91,100 ----