dispatch_queue_create(3) on macOS

The text d447b70ba1c7, as Mac OS X 10.8.5, Mac OS X 10.8.4, Mac OS X 10.8.3, Mac OS X 10.8.2, Mac OS X 10.8.1, Mac OS X 10.8 shipped it.

where blocks are scheduled for execution

dispatch_queue_create(3) on macOS now