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 2010 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
*** 247,268 ****
  int     uioafini(uio_t *, uioa_t *);
  extern  uioasync_t uioasync;
  
  #else   /* defined(_KERNEL) */
  
- #if     defined(__STDC__)
- 
  extern ssize_t readv(int, const struct iovec *, int);
  extern ssize_t writev(int, const struct iovec *, int);
  
- #else   /* defined(__STDC__) */
- 
- extern ssize_t readv();
- extern ssize_t writev();
- 
- #endif  /* defined(__STDC__) */
- 
  #endif  /* defined(_KERNEL) */
  
  #ifdef  __cplusplus
  }
  #endif
--- 249,261 ----