libstdc++-v3/test: Better skip for "use_service.cc"

2020-04-01  Andrea Corallo  <andrea.corallo@arm.com>

	* testsuite/experimental/net/execution_context/use_service.cc:
	Require pthread and gthreads.

libstdc++-v3/ChangeLog

+2020-04-01  Andrea Corallo  <andrea.corallo@arm.com>
+
+	* testsuite/experimental/net/execution_context/use_service.cc:
+	Require pthread and gthreads.
+
 2020-04-01  Gerald Pfeifer  <gerald@pfeifer.com>
 
 	* doc/xml/manual/appendix_free.xml: Move "free books" list from

libstdc++-v3/testsuite/experimental/net/execution_context/use_service.cc

@@ -15,7 +15,11 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-do run { target c++14 } }
+// { dg-do run }
+// { dg-options "-pthread"  }
+// { dg-require-effective-target c++14 }
+// { dg-require-effective-target pthread }
+// { dg-require-gthreads "" }
 
 #include <experimental/executor>
 #include <testsuite_hooks.h>