Fix testsuite build on Erlang R16B03 by using macros for old builtin types

Those macros are provided by `old_builtin_types.hrl` in rabbitmq-common.

Author: dumbbell

test/channel_operation_timeout_test_queue.erl

@@ -174,10 +174,10 @@
              out_counter           :: non_neg_integer(),
              in_counter            :: non_neg_integer(),
              rates                 :: rates(),
-             msgs_on_disk          :: gb_sets:set(),
-             msg_indices_on_disk   :: gb_sets:set(),
-             unconfirmed           :: gb_sets:set(),
-             confirmed             :: gb_sets:set(),
+             msgs_on_disk          :: ?GB_SET_TYPE(),
+             msg_indices_on_disk   :: ?GB_SET_TYPE(),
+             unconfirmed           :: ?GB_SET_TYPE(),
+             confirmed             :: ?GB_SET_TYPE(),
              ack_out_counter       :: non_neg_integer(),
              ack_in_counter        :: non_neg_integer(),
              disk_read_count       :: non_neg_integer(),