* exception.h (_exception_list): Drop redefinition for x86_64.

* include/exceptions.h: Disable content for x86_64 since it's not
	using frame based exception handling anymore.

winsup/cygwin/include/exceptions.h

@@ -1,6 +1,6 @@
 /* exceptions.h
 
-   Copyright 1996, 1997, 1998, 2000, 2001, 2005 Red Hat, Inc.
+   Copyright 1996, 1997, 1998, 2000, 2001, 2005, 2013 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -11,6 +11,8 @@ details. */
 #ifndef _EXCEPTIONS_H
 #define _EXCEPTIONS_H
 
+#ifndef __x86_64__
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
@@ -112,4 +114,6 @@ typedef struct _exception_list
 };
 #endif /* __cplusplus */
 
+#endif /* __x86_64__ */
+
 #endif /* _EXCEPTIONS_H */