+ @constant kSecCodeSignerRuntimeVersion A CFString indicating the version of runtime hardening policies
+ that the process should be opted into. The string should be of the form "x", "x.x", or "x.x.x" where
+ x is a number between 0 and 255. This parameter is optional. If the signer specifies
+ kSecCodeSignatureRuntime but does not provide this parameter, the runtime version will be the SDK
+ version built into the Mach-O.
+