compiling direct x version

[Bigpet]

This doesn't belong in the official repositoy. We could make the SDL version compilable under windows with cmake and that should work out of the box with ANGLE.

The issue is that we need to create the OpenGL context with EGL to use ANGLE but the normal Windows version uses WGL to do it. SDL uses egl on all platforms, duplicating the EGL code is not a good decision.