Windows build

[cdhunt]

Is there a technical reason blocking the build of the formae binary targeting Windows? It would be helpful for the client functions.

[discount-elf]

We are not ready to take on the overhead that supporting native windows entails. We will revisit native Windows support when things are moving less quickly.

[cdhunt]

I had to change one syscall in prompter for it to compile. I'll keep messing around with it.