* g++.dg/cpp1y/lambda-generic.C: Remove libstdc++ dependency.

From-SVN: r257001

gcc/testsuite/g++.dg/cpp1y/lambda-generic.C

 // Generic lambda test from N3690 5.1.2.5
 // { dg-do compile { target c++14 } }
 
-#include <iostream>
+struct A { } cout;
+template <class T> A& operator<<(A& a, T);
 
 int main()
 {
   auto glambda = [](auto a, auto&& b) { return a < b; };
   bool b = glambda(3, 3.14); // OK
   auto vglambda = [](auto printer) {
-    return [=](auto&& ... ts) { // OK: ts is a function parameter pack
-      printer(std::forward<decltype(ts)>(ts)...);
+    return [=](auto ... ts) { // OK: ts is a function parameter pack
+      printer(ts ...);
       return [=]() {
         printer(ts ...);
       };
     };
   };
   auto p = vglambda( [](auto v1, auto v2, auto v3)
-    { std::cout << v1 << v2 << v3; } );
+    { cout << v1 << v2 << v3; } );
   auto q = p(1, 'a', 3.14); // OK: outputs 1a3.14
   q(); // OK: outputs 1a3.14
 }