Implement http://wg21.link/p0302r1: Removing Allocator Support in std::function. These functions never worked, and as far as I know, no one ever called them.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@284164 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc.pass.cpp

@@ -8,10 +8,13 @@
 //===----------------------------------------------------------------------===//
 
 // <functional>
+// REQUIRES-ANY: c++98, c++03, c++11, c++14
 
 // class function<R(ArgTypes...)>
 
 // template<class A> function(allocator_arg_t, const A&);
+//
+// This signature was removed in C++17
 
 #include <functional>
 #include <cassert>