remove target override for bindgen because it isn't necessary (#112) #207

Job	Run time
cargo-publish	7s
macos-docs	21s
macos-test (nightly)	35s
ios-check (stable, aarch64-apple-ios)	24s
macos-test (stable)	24s
ios-check (stable, x86_64-apple-ios)	32s
ios-check (nightly, aarch64-apple-ios-sim)	36s
ios-check (stable, aarch64-apple-ios-sim)	24s
ios-check (nightly, aarch64-apple-ios)	38s
ios-check (nightly, x86_64-apple-ios)	30s
	4m 31s

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