glamor: update glamor_egl_init() to the new API

Xserver as of xorg/xserver!235, has changed the function signature.
It no longer uses a xf86 ScrnInfoPtr, but a ScreenPtr instead.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
12 jobs for sent/glamor-xvfb-fixes in 8 minutes and 29 seconds (queued for 3 minutes and 9 seconds)
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  Docker Image
passed debian-testing #476112

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