emscripten and input polling etc.

[davidjoffe]

(E.g. see https://github.com/slimbuck/dave_gnukem/tree/emsdk-build ... issues with SDL_Delay and the fact that we poll input which seems to cause problems for emscripten .. ) - low prio but would be nice to have sorted sometime

[midzer]

Is it working properly with Emscripten now?

Otherwise I can try to build and test...

[davidjoffe]

Hi, thanks! It's not working at all with Emscripten and I unfortunately don't have time at all right now to get it working, so it would be great if someone can help with it. I'm unfortunately extremely busy right now though so unable to give oversight at this stage. The Emscripten code that has been merged was based on a fork of an older version of Dave Gnukem. This issue should perhaps be combined with #205