[gcc r10-9744] libstdc++: Disable test for non-gthreads targets [PR 100180]

[Jonathan Wakely]

https://gcc.gnu.org/g:f0d22d31ceb1373f17045f2527ef2f2251d93be8

commit r10-9744-gf0d22d31ceb1373f17045f2527ef2f2251d93be8
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Apr 21 15:48:02 2021 +0100

    libstdc++: Disable test for non-gthreads targets [PR 100180]
    
    The Networking TS code still requires std::mutex on this branch, so the
    tests shouldn't run on targets without gthreads.
    
            PR libstdc++/100180
            * testsuite/experimental/net/internet/address/v6/members.cc:
            Require gthreads.

Diff:
---
 libstdc++-v3/testsuite/experimental/net/internet/address/v6/members.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/testsuite/experimental/net/internet/address/v6/members.cc b/libstdc++-v3/testsuite/experimental/net/internet/address/v6/members.cc
index b77d6a29e3d..5fffdd97691 100644
--- a/libstdc++-v3/testsuite/experimental/net/internet/address/v6/members.cc
+++ b/libstdc++-v3/testsuite/experimental/net/internet/address/v6/members.cc
@@ -17,6 +17,7 @@
 
 // { dg-do run { target c++14 } }
 // { dg-add-options net_ts }
+// { dg-require-gthreads "" }
 
 #include <experimental/internet>
 #include <sstream>