Include `winrt` headers in MSVC "syroot" search path (#118) #304

Job	Run time
cargo-deny	21s
Verify CLI	1m 9s
Verify compiles	2m 53s
Verify deterministic	2m 34s
Lint (ubuntu-22.04)	1m 34s
Publish Check (x86_64-unknown-linux-musl)	1m 0s
Publish Check (aarch64-unknown-linux-musl)	54s
Release	0s
	10m 25s

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