[PATCH] Replace C++14 feature used in C++11 test

[Jonathan Wakely]

	* testsuite/20_util/bind/91371.cc: Fix test to compile as C++11.

Tested powerpvc64le-linux, committed to trunk.

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commit d51d04301d30e199c53a705777d263b3f596e86f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Oct 23 16:49:55 2019 +0100

    Replace C++14 feature used in C++11 test
    
            * testsuite/20_util/bind/91371.cc: Fix test to compile as C++11.

diff --git a/libstdc++-v3/testsuite/20_util/bind/91371.cc b/libstdc++-v3/testsuite/20_util/bind/91371.cc
index 1c6f55e9ece..ad032ce1663 100644
--- a/libstdc++-v3/testsuite/20_util/bind/91371.cc
+++ b/libstdc++-v3/testsuite/20_util/bind/91371.cc
@@ -32,6 +32,6 @@ test01()
 
   static_assert(std::is_function<decltype(bar)>::value, "");
   static_assert(std::is_function<decltype(baz)>::value, "");
-  static_assert(std::is_pointer<std::decay_t<decltype(bar)>>::value, "");
-  static_assert(std::is_pointer<std::decay_t<decltype(baz)>>::value, "");
+  static_assert(std::is_pointer<std::decay<decltype(bar)>::type>::value, "");
+  static_assert(std::is_pointer<std::decay<decltype(baz)>::type>::value, "");
 }