[Xcb] making the icccm functions async

[Vincent Torri]

On Sun, 8 Apr 2007, Barton C Massey wrote:
>
> The names are fine.  Since they're all property requests,
> you're going to have to figure out how to factor them.
> xcb_get_text_property() in this file should probably move
> into the property library somehow.

actually, there is a possible round trip in xcb_get_text_property (if 
reply->bytes_after is not 0).

I've checked the Xlib code, but I don't see such code in it.

Vincent