Fix 48631_neg test in _GLIBCXX_VERSION_NAMESPACE mode

[François Dumont via Gcc-patches]

Here is a small patch to fix a test which fails in 
_GLIBCXX_VERSION_NAMESPACE mode.

IMHO it would be better to avoid putting <type_traits> content in 
versioned namespace, no ?

There is of course more work to do, so for now here is the simpler approach.

Ok to commit ?

François


diff --git a/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc b/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
index 3e80b73603e..f710806ef42 100644
--- a/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/default_delete/48631_neg.cc
@@ -26,4 +26,4 @@ struct D : B { };
 D d;
 std::default_delete<B[]> db;
 typedef decltype(db(&d)) type; // { dg-error "no match" }
-// { dg-prune-output "no type named 'type' in 'struct std::enable_if" }
+// { dg-prune-output "no type named 'type' in 'struct" }