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server: add destructor to wl_client_set_user_data

Pekka Paalanen requested to merge pq/wayland:mr/with-dtor into wip/client-user-data

Having an explicit destroy callback for the user data makes managing the user data lifetime much more convenient. All other callbacks, be they wl_resource request listeners, destroy listeners or destructors, or wl_client destroy listeners, can assume that the wl_client user data still exists if it was set. Otherwise making that guarantee would be complicated.

See: wayland/wayland#103 (comment 701894)

This is intended to be squashed into your original patch.

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