New test case.

From-SVN: r21140

gcc/testsuite/g++.old-deja/g++.ns/koenig5.C

+// To find function pointers in Koenig lookup is ok as long as we only find one.
+namespace A{
+  void foo();             // ERROR - 
+  struct X{};
+  void (*bar)(X*)=0;
+}
+using A::X;
+
+void (*foo)(X*)=0;        // ERROR - 
+
+void g()
+{
+  foo(new X);            // ERROR - both objects and functions found
+  bar(new X);            // ok
+}