Don't use CFBundleSignature, it was only needed for Classic Mac OS
compatibility. Similarly, LSRequiresCarbon was used to distinguish the
"new" Carbon applications from the Classic ones and is not needed any
longer.
CSResourcesFileMapped might still be used, but it's just an optimization
and we don't need it and it's just a s gratuitous difference with the
template used by Xcode, so remove it too.