[Xcb] Missing padding bytes

[Peter Harris]

Julien Danjou wrote:
> At 1220274337 time_t, Julien Danjou wrote:
>> Please review.
> 
> Peter, Bart?

SHM/QueryVersion doesn't need the extra padding, and SYNC/ALARMSTATE
looks wrong, but the rest of the patches look good.

Peter Harris
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