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modesetting: Add support for headless display

Vivek Kasireddy requested to merge Vivek/xserver:headless into master

In some Virtualization environments, a CRTC may not be available but a graphics device may still be present (/dev/dri/card0). In such situations, the modesetting DDX should still load Glamor (and DRI) and work in a "Headless" fashion.

Present's screen flip mode will handle the vblanks (and flips) in these situations.

Edited by Vivek Kasireddy

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