[boost] [config] 4 new C++11 macros added

A long time back I was asked for a bunch of new config macros which have finally now been added: BOOST_NO_CXX11_ALLOCATOR The standard library does not provide a C++11 version of `std::allocator` in <memory>. BOOST_NO_CXX11_ATOMIC_SP The standard library <memory> does not support atomic smart pointer operations. BOOST_NO_CXX11_HDR_FUNCTIONAL The standard library does not provide a C++11 compatible version of <functional>. BOOST_NO_CXX11_SMART_PTR The standard library header <memory> has no shared_ptr and unique_ptr. Enjoy, John.