Avoid another "unused import" warning on Windows #5470

Job	Run time
pure-rust-build	2m 4s
test	11m 20s
test-journey	3m 58s
test-32bit	5m 37s
test-32bit-cross (armv7-linux-androideabi)	1m 6s
test-fast (windows-latest)	15m 23s
test-fast (macos-latest)	4m 6s
test-fixtures-windows	13m 52s
test-fast (ubuntu-latest)	3m 43s
cargo-deny	29s
cargo-deny-advisories	27s
check-blocking	7s
check-packetline (ubuntu-latest)	6s
lint	3m 54s
WebAssembly (wasm32-unknown-unknown)	1m 8s
WebAssembly (wasm32-wasip1)	41s
Tests pass	1s
	1h 8m 2s

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