Remove obsolete uses of BOOST_MSVC

include/boost/smart_ptr/weak_ptr.hpp

@@ -155,8 +155,6 @@ public:
 
 #endif
 
-#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
-
     template<class Y>
     weak_ptr & operator=( weak_ptr<Y> const & r ) BOOST_SP_NOEXCEPT
     {
@@ -190,8 +188,6 @@ public:
         return *this;
     }
 
-#endif
-
     shared_ptr<T> lock() const BOOST_SP_NOEXCEPT
     {
         return shared_ptr<T>( *this, boost::detail::sp_nothrow_tag() );