Fix forward declaration of std::type_info for versioned-namespace

	PR libstdc++/80285
	* include/bits/shared_ptr_base.h [!__cpp_rtti] (type_info): Declare
	outside versioned namespace.

From-SVN: r248109

libstdc++-v3/ChangeLog

 2017-05-16  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/80285
+	* include/bits/shared_ptr_base.h [!__cpp_rtti] (type_info): Declare
+	outside versioned namespace.
+
 	* configure: Regenerate.
 
 2017-05-16  Marc Glisse  <marc.glisse@inria.fr>

libstdc++-v3/include/bits/shared_ptr_base.h

@@ -59,6 +59,10 @@
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
+#if !__cpp_rtti
+  class type_info;
+#endif
+
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #if _GLIBCXX_USE_DEPRECATED
@@ -68,10 +72,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #pragma GCC diagnostic pop
 #endif
 
-#if !__cpp_rtti
-  class type_info;
-#endif
-
  /**
    *  @brief  Exception possibly thrown by @c shared_ptr.
    *  @ingroup exceptions