OS-3752 Increase IOV_MAX to at least 1024

*** 1,12 ****
  /*
   * Copyright 1989 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*
   * Copyright (c) 1982, 1985, 1986 Regents of the University of California.
   * All rights reserved.  The Berkeley software License Agreement
   * specifies the terms and conditions for redistribution.
   */
--- 1,10 ----
*** 167,174 ****
  
  #define MSG_OOB         0x1             /* process out-of-band data */
  #define MSG_PEEK        0x2             /* peek at incoming message */
  #define MSG_DONTROUTE   0x4             /* send without using routing tables */
  
- #define MSG_MAXIOVLEN   16
- 
  #endif /*!_sys_socket_h*/
--- 165,170 ----