libitm_i.h (_Unwind_DeleteException): Declare weak.

	* libitm_i.h (_Unwind_DeleteException): Declare weak.
	* eh_cpp.cc (_Unwind_DeleteException): Define for
	!HAVE_ELF_STYLE_WEAKREF.

From-SVN: r183049
diff --git a/libitm/libitm_i.h b/libitm/libitm_i.h
index f922d22..c00389d 100644
--- a/libitm/libitm_i.h
+++ b/libitm/libitm_i.h
@@ -39,6 +39,10 @@
 #include "local_type_traits"
 #include "local_atomic"
 
+/* Don't require libgcc_s.so for exceptions.  */
+extern void _Unwind_DeleteException (_Unwind_Exception*) __attribute__((weak));
+
+
 #include "common.h"
 
 namespace GTM HIDDEN {