Link to a tiny patch to libstdc++-4.7 to work around the <chrono> issues
from the C++ status page.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154890 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/www/libstdc++4.7-clang11.patch b/www/libstdc++4.7-clang11.patch
new file mode 100644
index 0000000..3f03007
--- /dev/null
+++ b/www/libstdc++4.7-clang11.patch
@@ -0,0 +1,13 @@
+Index: include/std/type_traits
+===================================================================
+--- include/std/type_traits (revision 185724)
++++ include/std/type_traits (working copy)
+@@ -1746,7 +1746,7 @@
+
+ template<typename _Tp, typename _Up>
+ struct common_type<_Tp, _Up>
+- { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
++ { typedef typename decay<decltype(true ? declval<_Tp>() : declval<_Up>())>::type type; };
+
+ template<typename _Tp, typename _Up, typename... _Vp>
+ struct common_type<_Tp, _Up, _Vp...>