Conditionally stop using outdated msvc workarounds.

include/boost/type_traits/has_nothrow_destructor.hpp

@@ -11,7 +11,7 @@
 
 #include <boost/type_traits/has_trivial_destructor.hpp>
 
-#if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(__SUNPRO_CC) && !defined(BOOST_MSVC)
+#if !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(__SUNPRO_CC) && !(defined(BOOST_MSVC) && (_MSC_FULL_VER < 190023506))
 
 #include <boost/type_traits/declval.hpp>
 #include <boost/type_traits/is_destructible.hpp>

include/boost/type_traits/remove_pointer.hpp

@@ -18,7 +18,7 @@
 
 namespace boost {
 
-#ifdef BOOST_MSVC
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1900)
 
 namespace detail{