Do not always rebuild `talpid-wireguard` on Android #208

Job	Run time
build-ios (aarch64-apple-ios)	1m 30s
build-ios (aarch64-apple-ios-sim)	1m 50s
clippy-check-ios (aarch64-apple-ios)	1m 1s
clippy-check-ios (aarch64-apple-ios-sim)	1m 5s
	5m 26s

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