w: disable functions unused on Windows #162

Job	Run time
cargo test (ubuntu-latest)	30s
cargo test (macOS-latest)	56s
Code Coverage (ubuntu-latest, unix)	1m 55s
cargo clippy -- -D warnings (ubuntu-latest)	20s
cargo test (windows-latest)	2m 1s
cargo check (ubuntu-latest)	19s
Code Coverage (macos-latest, macos)	5m 56s
cargo clippy -- -D warnings (macOS-latest)	23s
cargo check (macOS-latest)	36s
Code Coverage (windows-latest, windows)	5m 36s
cargo clippy -- -D warnings (windows-latest)	1m 26s
cargo check (windows-latest)	1m 32s
cargo fmt --all -- --check	12s
	21m 42s

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