client: remove definition of wl_global

[Markus Ongyerth]

Hi,

I once again seem to be missing the original message for some reason, so if I 
failed to properly fix up my headers again, I'm refering to [1]

Reviewed-By: Markus Ongyerth <wl at ongy.net>

[1] https://patchwork.freedesktop.org/patch/204915/

Cheers,
ongy
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