[Xcb] Missing copyright notices

[Donnie Berkholz]

On 10:02 Wed 26 Mar     , Barton C Massey wrote:
> XCB util authors: We can't just go around slapping a copyright notice 
> and license on your code for you without your permission. Please post 
> to this list explicitly acknowledging that we have permission to do 
> so.  List each file that your are the original author of and that 
> Julien has added a copyright notice and/or license to with his 
> patches.  A good form to use might be something like.

Those of you with GPG keys, it would be useful if you used them to sign 
this message.

Thanks,
Donnie