Many faust tools do not natively support Windows

[Spacechild1]

I had a look at some tools in tools/faust2appls and noticed that many of these build scripts only support Linux and macOS. There are some additional scripts for cross-compiling from Linux to Windows, e.g. faust2w64puredata, but there is basically no way to use these tools on a regular Windows machine. It would be great if they would at least natively support MinGW/Msys2.

Of course, it would be a lot work to update (and test!) all the tools, but it could be done incrementally. I might be able to do the first step and update faust2puredata.