[Xcb] Recent fixes for bitmap conversions

[Peter Harris]

Ulrich Eckhardt wrote:
> The attached program creates a 100x100 pixel window and excludes a pixmap from 
> its shape.

Thanks for the test.

I can confirm that xcb_image is still broken. Among other things, it
doesn't account for servers where image_byte_order != image_bit_order.

I'm going to poke at it a bit, and let the list know what I come up with.

Peter Harris
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