remove support for non-ANSI compilation

*** 18,36 ****
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #ifndef _ALLOCA_H
  #define _ALLOCA_H
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <sys/types.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
--- 18,36 ----
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
+  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+  *
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  #ifndef _ALLOCA_H
  #define _ALLOCA_H
  
  #include <sys/types.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
*** 54,76 ****
  
  #if defined(__BUILTIN_VA_ARG_INCR) || \
          defined(__sparc) || defined(__i386) || defined(__amd64)
  #define alloca(x)       __builtin_alloca(x)
  
- #ifdef  __STDC__
  extern void *__builtin_alloca(size_t);
- #else
- extern void *__builtin_alloca();
- #endif
  
  #else
  
- #ifdef  __STDC__
  extern void *alloca(size_t);
- #else
- extern void *alloca();
- #endif
  
  #endif  /* defined(__BUILTIN_VA_ARG_INCR) || defined(__sparc) ... */
  
  #ifdef __cplusplus
  }
--- 54,68 ----