Support for non-Windows platforms?

[Ithamar]

I'm interested in porting Carnivores to non-Windows platforms (including using Emscripten to compile to WebAssembly for HTML5/web support).
I've had a look at the code base, and the following parts stand out:

• File IO. Change all the CreateFile/ReadFile/WriteFile/CloseFile code to fopen/fread/fwrite/fclose.
• Memory. Change HeapAlloc to use malloc, at least on non-Windows platforms.
• Windowing/2D Surface handling: Use SDL (again, possibly only on non-Windows platform, if we want to keep the native code).

There's likely some more, like font handling and the like, but I'm sure that shouldn't be too hard to abstract away.

My main question here is, would the maintainer(s) of this repository be interested in a Pull Request for that?

I'd prefer to not be yet-another-Carnivores fork...