The configuration system has changed from a 68K Macintosh application
that must be run within Mini vMac to a C program that can be compiled
and run on macOS. This lets us throw out all the code for running a
bootstrap copy of Mini vMac and shuttling data between the build machine
and the emulator, which makes the build much faster. It also means the
port can now be built without needing the Macintosh Plus ROM file.
