client: check event opcode in queue_event

If the client binds to a global with an interface mismatch, it may receive an
event from the server with an unknown opcode. See [1].

Instead of crashing, print a more useful debug message and close the connection.

[1]: wayland/wayland#113

Signed-off-by: Simon Ser <simon.ser@intel.com>
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00:01:50