libstdc++/66902 Make _S_debug_messages static.

	PR libstdc++/66902
	* src/c++11/debug.cc (_S_debug_messages): Give internal linkage.

From-SVN: r227228

libstdc++-v3/ChangeLog

+2015-08-26  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/66902
+	* src/c++11/debug.cc (_S_debug_messages): Give internal linkage.
+
 2015-08-24  François Dumont  <fdumont@gcc.gnu.org>
 
 	PR libstdc++/60519

libstdc++-v3/src/c++11/debug.cc

@@ -103,7 +103,7 @@ namespace
 
 namespace __gnu_debug
 {
-  const char* _S_debug_messages[] =
+  static const char* _S_debug_messages[] =
   {
     // General Checks
     "function requires a valid iterator range [%1.name;, %2.name;)",