headers for OpenGL, OpenAL, and SDL

[Jamie Pelcis]

Here's a few headers for anyone who wants them, with the only license 
restriction from me being that I am in no way, shape, or form 
responsible for any problems.

OpenGL
http://www.summerseas.com/jpelcis/downloads/opengl.zip

OpenAL
http://www.summerseas.com/jpelcis/downloads/openal.zip

SDL
http://www.summerseas.com/jpelcis/downloads/sdl.zip


These are essentially untested, so please tell me if something goes wrong.

On a different note...
Walter, would you please replace std.loader?  If Mike Parker (Derelict 
project) doesn't mind you using his, it would be a good change.