Put use of Apple SDK behind feature #281

Job	Run time
cargo-deny (advisories)	20s
lint	1m 3s
cargo-deny (bans licenses sources)	21s
aarch64-apple-darwin / build	1m 5s
aarch64-apple-ios / build	53s
aarch64-unknown-linux-gnu / build	1m 9s
aarch64-unknown-linux-musl / build	2m 2s
arm-linux-androideabi / build	50s
armv7-linux-androideabi / build	50s
i686-pc-windows-gnu / build	3m 16s
i686-pc-windows-msvc / build	3m 15s
i686-unknown-linux-gnu / build	1m 21s
i686-unknown-linux-musl / build	1m 40s
msrv / build	4m 21s
x86_64-apple-darwin / build	58s
x86_64-pc-windows-gnu / build	3m 45s
x86_64-pc-windows-msvc / build	4m 6s
x86_64-unknown-freebsd / build	49s
x86_64-unknown-linux-gnu / build	1m 15s
x86_64-unknown-linux-musl / build	1m 24s
x86_64-unknown-netbsd / build	51s
	35m 34s

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