fix: building failed in release mode

[guzhenhuaGitHub]

code like this may cause an error in release mode:

    let viewController = Inject.ViewControllerHost(CustomViewController())
    viewController.xxxProperty = newValue

error like this:

    value of type 'InjectViewControllerType' (aka 'UIViewController') has no member 'xxxProperty'

[krzysztofzablocki]

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