Revert "fix a couple of gcc warnings"

This reverts commit 79e73a715c.

include/boost/archive/iterators/transform_width.hpp

@@ -113,11 +113,10 @@ public:
     transform_width(BOOST_PFTO_WRAPPER(T) start) : 
         super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start)))),
         m_buffer_out_full(false),
-        m_buffer_out(),
         // To disable GCC warning, but not truly necessary 
 	    //(m_buffer_in will be initialized later before being 
 	    //used because m_remaining_bits == 0)
-        m_buffer_in(), 
+        m_buffer_in(0), 
         m_remaining_bits(0),
         m_end_of_sequence(false)
     {}

include/boost/serialization/variant.hpp

@@ -66,6 +66,7 @@ void save(
 ){
     int which = v.which();
     ar << BOOST_SERIALIZATION_NVP(which);
+    typedef typename  boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types types;
     variant_save_visitor<Archive> visitor(ar);
     v.apply_visitor(visitor);
 }