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Mac joystick: ignore duplicate HID elements.
The DualShock 4 has all elements listed twice: once in the top-level list of elements, and once in an "Application Collection" element at the top-level. Each element has a proper cookie with a unique value, so now we descend into each element collections, but before we add an element to the device's list, we make sure we don't already have one with that cookie, probably from another collection or a buggy device.
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