Function SecIdentityCopyPreferred 

pub unsafe extern "C-unwind" fn SecIdentityCopyPreferred(
    name: &CFString,
    key_usage: Option<&CFArray>,
    valid_issuers: Option<&CFArray>,
) -> Option<CFRetained<SecIdentity>>

👎Deprecated: renamed to SecIdentity::preferred

Available on crate features SecBase and SecIdentity only.