Fix tests

Author: gummif

tests/socket_ref.cpp

@@ -7,7 +7,7 @@ static_assert(std::is_nothrow_swappable_v<zmq::socket_ref>);
 #endif
 static_assert(sizeof(zmq::socket_ref) == sizeof(void *), "size mismatch");
 static_assert(alignof(zmq::socket_ref) == alignof(void *), "alignment mismatch");
-static_assert(std::is_trivially_copyable<zmq::socket_ref>::value,
+static_assert(ZMQ_IS_TRIVIALLY_COPYABLE(zmq::socket_ref),
               "needs to be trivially copyable");
 
 TEST_CASE("socket_ref default init", "[socket_ref]")