Switch from deprecated OSSpinLock to os_unfair_lock#8
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unfair_lock will be used when applicable, falling back on OSSpinLock
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When building with the iOS 10 SDK, OSSpinLock() triggers warnings in Xcode as it has been deprecated.
This pull request switches to Apple's replacement, os_unfair_lock ( https://developer.apple.com/reference/os/1646466-os_unfair_lock_lock ) when the base SDK is iOS 10+ or macOS 10.12+.