[Xcb] Deeper pixmaps for xcb-shape masks

[Javier Pollak]

Hi, I'm working on a patch for bspwm to add rounded corners to windows and
their borders.
Everything works just as expected but because the mask applied to the
Bounding and Clipping shape is required to be 1 bit deep.
This makes my rounded corners look very jagged since there's no value in
between 0 (transparent) and 1 (opaque).

[Here's a scrot](https://i.imgur.com/83Ufhjs.png)

Is there any way to remedy this?
What I tried so far is to apply an additional mask to the window background
itself since it allows for a mask of the same depth as the window.
The problem with that solution is that it does not apply to the border...
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