Added protected destructor to the base type error_info_base

[SVN r44781]

include/boost/exception/info.hpp

@@ -36,6 +36,12 @@ boost
 
             virtual std::type_info const & tag_typeid() const = 0;
             virtual std::string value_as_string() const = 0;
+
+			protected:
+
+			~error_info_base()
+				{
+				}
             };
         }