remove support for non-ANSI compilation

*** 17,31 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
   */
- /*
-  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
-  */
  
  #ifndef _SYS_DDIDMAREQ_H
  #define _SYS_DDIDMAREQ_H
  
  #ifdef  __cplusplus
--- 17,30 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+  *
   * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
   */
  
  #ifndef _SYS_DDIDMAREQ_H
  #define _SYS_DDIDMAREQ_H
  
  #ifdef  __cplusplus
*** 507,523 ****
   *
   * If a DMA callback funtion is set to anything other than the following
   * defines then it is assumed that one wishes a callback and is providing
   * a function address.
   */
- #ifdef __STDC__
  #define DDI_DMA_DONTWAIT        ((int (*)(caddr_t))0)
  #define DDI_DMA_SLEEP           ((int (*)(caddr_t))1)
- #else
- #define DDI_DMA_DONTWAIT        ((int (*)())0)
- #define DDI_DMA_SLEEP           ((int (*)())1)
- #endif
  
  /*
   * Return values from callback functions.
   */
  #define DDI_DMA_CALLBACK_RUNOUT 0
--- 506,517 ----