[gcc r13-555] libstdc++: Skip tests that fail for the versioned namespace

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:1815462a6e53465c404f8a5f6116891492d4b50b

commit r13-555-g1815462a6e53465c404f8a5f6116891492d4b50b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue May 17 09:32:36 2022 +0100

    libstdc++: Skip tests that fail for the versioned namespace
    
    Most tests for the contents of header synopses need to be supressed for
    the versioned namespace build, because redeclaring the entities in std
    fails when they were originally declared in std::__8.
    
    I added these tests recently without the suppression, so they fail.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/expected/synopsis.cc: Skip for versioned
            namespace.
            * testsuite/27_io/headers/iosfwd/synopsis.cc: Likewise.

Diff:
---
 libstdc++-v3/testsuite/20_util/expected/synopsis.cc     | 1 +
 libstdc++-v3/testsuite/27_io/headers/iosfwd/synopsis.cc | 1 +
 2 files changed, 2 insertions(+)

diff --git a/libstdc++-v3/testsuite/20_util/expected/synopsis.cc b/libstdc++-v3/testsuite/20_util/expected/synopsis.cc
index 304bae93ebd..3a7eef3eee4 100644
--- a/libstdc++-v3/testsuite/20_util/expected/synopsis.cc
+++ b/libstdc++-v3/testsuite/20_util/expected/synopsis.cc
@@ -1,5 +1,6 @@
 // { dg-options "-std=gnu++23" }
 // { dg-do compile { target c++23 } }
+// { dg-require-normal-namespace "" }
 
 #include <expected>
 
diff --git a/libstdc++-v3/testsuite/27_io/headers/iosfwd/synopsis.cc b/libstdc++-v3/testsuite/27_io/headers/iosfwd/synopsis.cc
index 467d63609bd..b6d3fa7a719 100644
--- a/libstdc++-v3/testsuite/27_io/headers/iosfwd/synopsis.cc
+++ b/libstdc++-v3/testsuite/27_io/headers/iosfwd/synopsis.cc
@@ -1,4 +1,5 @@
 // { dg-do compile }
+// { dg-require-normal-namespace "" }
 
 #include <iosfwd>