Xwayland/glamor broken after glamor-next merge

[Steven Newbury]

Since commit 6d4954884908ea9894fcfe9836db1ba7bb45be61 ("Merge 
remote-tracking branch 'origin/master' into glamor-next") I've just 
been getting completely black windows with anything other than really 
simple xlib apps such as xterm.  I've biscected it down the the above 
merge commit by running glxgears on each checkout.

Am I the only one seeing this?
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