[patch] libstdc++/66902 Make _S_debug_messages static.

[Jonathan Wakely <jwakely@redhat.com>]

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This patch removes a public symbol from the .so, which is generally a
bad thing, but there should be no users of this anywhere (it's never
declared in any public header).

For targets using symbol versioning this isn't exported at all, as it
isn't in the linker script, so this really just makes other targets
consistent with the ones using versioned symbols.

Tested powerpc64le-linux and dragonfly-4.2, committed to trunk

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commit d35fbf8937930554af62a7320806abecf7381175
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jul 17 10:15:03 2015 +0100

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

diff --git a/libstdc++-v3/src/c++11/debug.cc b/libstdc++-v3/src/c++11/debug.cc
index 997c0f3..c435de7 100644
--- a/libstdc++-v3/src/c++11/debug.cc
+++ b/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;)",