[PATCH, g++, testsuite] Skip thread_local6.C on target using wrapper

[Tony Wang]

Hi there,

It's a very simple test case modification to fix the test case failure on ARM bare metal target.
thread_local6.C is a test case to test the behavior of the deconstruct of a thread local variable, and it just
use _exit(0) to override the return 1(calling exit(1)). However, such a behavior can't be detected on embedded
target with dejagnu wrapper mechanism, because the wrapper will only output the return value in exit() instead
of _exit(). There're some similar test cases(g++.dg/init/ref15.C) already avoided to test on the target using
wrapper, so this patch just follow their pattern to avoid the test case on target using wrapper.

gcc/gcc/testsuite/ChangeLog:
2014-08-20  Tony Wang  <tony.wang@arm.com>

        * g++.dg/tls/thread_local6.C: Skip this test case when
        target uses dejagnu wrapper.

diff --git a/gcc/testsuite/g++.dg/tls/thread_local6.C b/gcc/testsuite/g++.dg/tls/thread_local6.C
index 378cf3d58c7bcbebb224137b353301f75b420d5a..6cf820e0e9a181e403aa2c0ebaa822ab7b6f7aab 100644
--- a/gcc/testsuite/g++.dg/tls/thread_local6.C
+++ b/gcc/testsuite/g++.dg/tls/thread_local6.C
@@ -1,6 +1,6 @@
 // Test for cleanups in the main thread without -pthread.
 
-// { dg-do run { target c++11 } }
+// { dg-do run { target { c++11 && unwrapped } } }
 // { dg-add-options tls }
 // { dg-require-effective-target tls_runtime }