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vulkan/wsi: Use explicit sync for Wayland

Wayland actually has an extension for this. Most of the work in this MR is the plumbing which we can hopefully re-use for KMS (once we switch to atomic) and X11 once we get a syncobj extension.

Very few compositors support this today: only Weston and the ChromeOS compositor to my knowledge. I tested it using Weston. My (probably misplaced) hope is that having Linux clients have a good path to using explicit sync on Wayland will motivate GNOME Shell, KWin, and wlroots/sway devs to hook up explicit sync in their compositor.s

Edited by Jordan Justen

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