[Xcb] Missing copyright notices

[Julien Danjou]

Hi,

I'm preparing the Debian packaging of xcb-util.

I saw that there's a bunch of files without any copyright notice. I've
reviewed git log for each of these and done patch per subdirectory.

Any comment welcome. If some reformatting is needed, it can also be
done.

These patches do not add a COPYING file; I let you add one, this would
not be the hardest part.

Cheers,
-- 
Julien Danjou
// ᐰ <julien at danjou.info>   http://julien.danjou.info
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