Minor changes

Utilities/variant.hpp

@@ -73,16 +73,6 @@ namespace std {
 
 		}; // class bad_variant_access
 
-		template <typename R = void>
-		struct MAPBOX_VARIANT_DEPRECATED static_visitor
-		{
-			using result_type = R;
-
-		protected:
-			static_visitor() {}
-			~static_visitor() {}
-		};
-
 		namespace detail {
 
 			static constexpr std::size_t invalid_value = std::size_t(-1);