[patch] libstdc++/64483 add dg-require to test

[Jonathan Wakely]

This test is failing on hpux.

Tested x86_64-linux, committed to trunk.

commit 481c7cee8f24798d859a619c955a721846e86742
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Sun Jan 4 13:45:28 2015 +0000

    	PR libstdc++/64483
    	* testsuite/18_support/exception_ptr/64241.cc: Use
    	dg-require-atomic-builtins.

diff --git a/libstdc++-v3/testsuite/18_support/exception_ptr/64241.cc b/libstdc++-v3/testsuite/18_support/exception_ptr/64241.cc
index c7e1433..362bb71 100644
--- a/libstdc++-v3/testsuite/18_support/exception_ptr/64241.cc
+++ b/libstdc++-v3/testsuite/18_support/exception_ptr/64241.cc
@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++11 -fno-exceptions -O0" }
+// { dg-require-atomic-builtins "" }
 
 #include <exception>
 #include <testsuite_hooks.h>