update xtl disjunction

Author: fbourgin

include/xtensor-r/rcontainer.hpp

@@ -142,7 +142,7 @@ namespace xt
         using difference_type = typename storage_type::difference_type;
 
 #ifndef XTENSOR_R_ALLOW_REINTERPRETATION
-        static_assert(xtl::disjunction<std::is_same<r_type, int32_t>,
+        static_assert(std::disjunction<std::is_same<r_type, int32_t>,
                                        std::is_same<r_type, double>,
                                        std::is_same<r_type, Rbyte>,
                                        std::is_same<r_type, rlogical>,