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 (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  
  #ifndef _SYS_INSTANCE_H
  #define _SYS_INSTANCE_H
*** 132,146 ****
  #define INST_WALK_CONTINUE      0
  #define INST_WALK_TERMINATE     1
  
  
  #else   /* _KERNEL */
- #ifdef __STDC__
  extern int inst_sync(char *pathname, int flags);
- #else
- extern int inst_sync();
- #endif  /* __STDC__ */
  #endif  /* _KERNEL */
  
  #define INST_SYNC_IF_REQUIRED   0
  #define INST_SYNC_ALWAYS        1
  
--- 134,144 ----