Add linux-drm-syncobj-v1 protocol #4629

Job	Run time
format	6s
smithay-check-features	2m 49s
clippy-check	4m 10s
check-msrv	1m 12s
smallvil-check	48s
smithay-tests	2m 34s
anvil-check-features	2m 6s
check-minimal	58s
Documentation on Github Pages	1m 2s
WLCS: Core tests	1m 12s
WLCS: Output tests	1m 16s
WLCS: Pointer input tests	1m 3s
WLCS: Bad Buffer Test	1m 2s
	20m 18s

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