bump xcb-types requirement to 0.8.0
bump xcb-types requirement to 0.8.0

We won't build with anything less now that we have the xcb 1.12 patches
landed.

Signed-off-by: Tycho Andersen <6b523322678240882acbb4da5312a12d8cd0082d@tycho.ws>

tych0/xcffib