remove support for non-ANSI compilation

@@ -17,37 +17,31 @@
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*
+ * Copyright 2014 Garrett D'Amore <garrett@damore.org>
+ *
  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
 #ifndef _EXECINFO_H
 #define _EXECINFO_H
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 /*
  * These functions provide glibc-compatible backtrace functionality.
  * Improved functionality is available using Solaris-specific APIs;
  * see man page for walkcontext(), printstack() and addtosymstr().
  */
 #ifdef  __cplusplus
 extern "C" {
 #endif
 
-#if defined(__STDC__)
 extern int backtrace(void **, int);
 extern char **backtrace_symbols(void *const *, int);
 extern void backtrace_symbols_fd(void *const *, int, int);
-#else
-extern int backtrace();
-extern char **backtrace_symbols();
-extern void backtrace_symbols_fd();
-#endif
 
 #ifdef  __cplusplus
 }
 #endif