Following the unix port. Support for building variants with msvc was done by @stinos.
GNU readline support for the unix port was removed in acaa30b604 and in 5e83a75c78, so it's also no longer supported in the windows port.
acaa30b604
5e83a75c78
This is to keep the top-level directory clean, to make it clear what is core and what is a port, and to allow the repository to grow with new ports in a sustainable way.