Add support for visionOS #928

Job	Run time
clippy	24s
msrv (ubuntu-latest)	2m 7s
cross (ubuntu-latest, nightly)	2m 28s
msrv (windows-latest)	1m 58s
fmt	6s
cross (ubuntu-latest, stable)	1m 22s
security_audit	7s
cross (macos-latest, nightly)	1m 8s
cross (macos-latest, stable)	1m 11s
wine	1m 56s
test (ubuntu-latest, nightly)	1m 31s
test (ubuntu-latest, beta)	1m 38s
test (ubuntu-latest, stable)	1m 33s
test (windows-latest, nightly)	1m 43s
test (windows-latest, beta)	1m 42s
test (windows-latest, stable)	2m 58s
test (macos-latest, nightly)	1m 3s
test (macos-latest, beta)	1m 5s
test (macos-latest, stable)	1m 6s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 33s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 8s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 11s
	33m 58s

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