remove support for non-ANSI compilation

@@ -18,19 +18,19 @@
  * 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
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <sys/types.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif

@@ -54,23 +54,15 @@
 
 #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
 }